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Mail Assure
Mail Assure is cloud email security, continuity and archiving — filtering both directions with threat data pooled across every customer, administered across all your client tenants from one console instead of thirty admin centres. And if your client already owns Defender for Office, we will say so.
Data residency & processing
An email archive is years of correspondence — contracts, HR matters, financial discussions, and personal data under the DPDP Act. N-able’s Bengaluru GCC (100+ staff, June 2026) is a fact about people, not about where mail rests. Establish the storage region for filtering and for the archive separately, since they need not be the same, plus the sub-processor list and — the one buyers forget — how you get archived mail back on termination, in what format and how fast.
On CERT-In: the 180-day ICT log duty applies to you as the regulated entity, not to N-able. CERT-In’s own FAQ permits storage outside India provided logs are producible to the authorities in reasonable time — but if you are IRDAI-regulated, the 2023 audit annexure asks as a plain yes/no whether ICT logs are stored in India, and that is where an offshore region actually costs you.
Buy through TechBag
Same software. Better outcome — at a lower cost.
How it’s rated
Full scoreboard ↓Quick answer
The N-able platform family
This page covers Mail Assure — email security and archiving. The rest of the portfolio:
Quick facts
30-second orientation- Product
- Mail Assure — cloud email security & archiving
- Vendor
- N-able (NYSE: NABL) — spun out of SolarWinds 2021
- The category
- Email security for MSPs and IT teams
- The mechanism
- Collective intelligence — threat data pooled across customers
- Strong against
- Volume attacks — prior sightings vaccinate everyone
- Less differentiating
- Targeted attacks with no prior sighting
- Also includes
- Continuity and long-term archiving
- The MSP reason
- One console across many client tenants
- Ask first
- What does M365 already give your clients?
- Not the deepest
- Proofpoint and Mimecast go further, and cost more
- Vs
- Proofpoint, Mimecast, Abnormal AI, Defender for Office
- In India via
- TechBag — scoping, licensing, local support, GST
Understand email security before you buy it
Most product pages skip this. We start here — so you buy a capability, not a buzzword.
What is Mail Assure?
Cloud email security, continuity and archiving for MSPs — filtering both directions using threat data pooled across the whole customer base, administered across every client tenant from one console.
Native filtering alone vs a dedicated layer — the honest table
What consolidation actually replaces, dimension by dimension.
| Dimension | Native filtering alone | Mail Assure (N-able) |
|---|---|---|
| Administration | Thirty Microsoft admin centres | One console, every tenant |
| Policy consistency | Drifts per tenant | Applied once |
| Quarantine review | Thirty logins | One place |
| Threat learning | Per tenant | Pooled across all customers |
| Outbound mail | Often unfiltered | Filtered — limits the spread |
| Platform outage | Total — nobody sends | Continuity keeps mail flowing |
| Retention | Tied to the mailbox | Independent of the platform |
| Targeted attacks | (varies) | The honest limit — no prior sighting |
Filtering both directions, continuity and archiving across every client tenant from one console — which for an MSP is frequently the whole business case. Honest limits: pooled intelligence is fast against volume attacks and has NO prior sighting to learn from on a targeted one; this is not the deepest email product on the market; and if your client already owns Defender for Office 365 in a higher M365 tier, configuring that may be the right answer. We will tell you when it is.
The five pieces of the platform
Vendors love diagrams; buyers need to know what they’re actually operating. Here’s the whole platform, demystified.
Collective Intelligence
Threat data gathered across every customer informs filtering for all of them, so a campaign seen against one organisation improves protection for the rest within minutes. Genuinely effective against volume attacks — the first few targets effectively vaccinate everyone else — and less differentiating against something written for one company, where there is no prior sighting to learn from.
Inbound And Outbound
Filtering applies to mail leaving as well as arriving, which matters because a compromised account inside your client sends convincing mail to their customers and partners. Outbound filtering is the control that limits how far a compromise travels, and it is routinely overlooked in evaluations focused on inbound threats.
Continuity
If the mail platform becomes unavailable, people can still send and receive through the filtering layer. For a client whose business runs on email — which is most of them — that turns a total outage into a degraded service, and it is the feature they remember afterwards.
Long-Term Archiving
Archiving with retention independent of the mail platform, which is frequently the part that actually closes the deal. Retention requirements arrive from regulation and contract rather than from security, and they persist long after a mailbox is deleted or an employee leaves.
One Console, Many Tenants
Filtering, continuity and archiving administered across every client from a single console rather than tenant by tenant inside each client's Microsoft admin centre. For an MSP with thirty clients on Microsoft 365, this is often the real reason to buy a dedicated layer at all — and it is a good one.
One telemetry fabric across endpoint, cloud, and network — threats correlated once, not chased console to console.
Twelve capabilities. Filter, keep flowing, retain.
Mail Assure filters inbound and outbound mail using intelligence pooled across every customer, keeps mail flowing during an outage and archives it independently — the email layer of portfolio, and paired with the human firewall.
Inbound Mail Filtering
Spam, malware and phishing filtered before delivery, informed by threat data pooled across the whole customer base. Strong against the volume attacks that make up most of what arrives. The mass, stopped at the door.
Pooled Threat Data
A campaign seen against one customer improves filtering for every other customer within minutes. Effective against volume; less so against something written specifically for one organisation, where there is no prior sighting. One target protects the rest.
Outbound Mail Filtering
Mail leaving is filtered too, which limits how far a compromised account travels before someone notices. Routinely overlooked in evaluations that focus only on what arrives — and it protects your client's reputation with their own customers. Containment, not just defence.
Quarantine & End-User Control
Held mail available for review, with end-user digests so people can release their own false positives rather than raising a ticket for each one. The unglamorous feature that decides how much support load email security creates. Fewer tickets, same protection.
Email Continuity
Send and receive through the filtering layer when the mail platform is unavailable. For a client whose business runs on email, that turns a total outage into a degraded service — and it is what they remember about you afterwards. An outage that is not total.
Long-Term Archiving
Retention independent of the mail platform, surviving mailbox deletion and employee departure. Frequently the part that closes the deal, because retention obligations come from regulation and contract rather than from security. Kept because you must, not because you might.
Archive Search & eDiscovery
Finding messages in the archive when legal, regulatory or HR needs them. An archive you cannot search quickly is a compliance liability rather than an asset — test retrieval, not just retention. Test the search, not the storage.
Many Client Tenants, One Console
Administer filtering, continuity and archiving across every client from one place rather than inside each client's Microsoft admin centre. For an MSP with thirty clients this is often the actual reason to buy a dedicated layer. The real MSP argument.
Filtering Independent Of The Mailbox
The filtering layer is not the same vendor as the mail platform, which some buyers want deliberately — a failure or a gap in one is not automatically a failure in the other. A defensible position, though not automatically the right one. Different vendor, different failure modes.
Reporting Per Client
What was filtered, held and delivered, per client, for a monthly review. Evidence that the layer is doing something is what justifies its line on the invoice. Show the value, do not assert it.
Sits Beside The Rest Of N-able
A separate product from the RMM platforms, Cove and the security line, commonly bundled into one quote. Price the whole basket rather than the line — a competitor's bundle is not comparable to one component. Separate product, one quote.
Good, Not The Deepest
Proofpoint and Mimecast go further against sophisticated targeted attacks and cost accordingly; Abnormal AI's behavioural approach is genuinely different. Mail Assure's case is being good, straightforward and administered alongside a stack you already run. Know which problem you have.
Watch the N-able platform in action
Email security, demonstrated.
Demo of N-able Vulnerability Management
The wider N-able platform Mail Assure sits within.
Linux Patch Management in N-central & N-sight
The RMM platforms this is commonly bought alongside.
Linux Patch Management in N-central
The larger of the two RMM platforms.
Want a live, India-context walkthrough for your environment?
Book a guided demo →The filter that came with the mailbox. Or a dedicated layer.
Here’s what genuinely sets it apart — starting with whether you need it at all.
Ask first whether you need a dedicated layer at all
We would rather start by helping you decide against buying this than by selling it, because the honest answer for some buyers is that their clients already have enough. What your clients probably already own: if they are on Microsoft 365, they have Exchange Online Protection at every tier — spam and malware filtering that is genuinely competent. At higher licence tiers, Defender for Office 365 adds more capable anti-phishing, safe links and safe attachments. Many organisations pay for these in a licence they already hold and never turn them on properly, which means the first thing to check is not a competitor's product but whether the tooling in hand is configured. When a dedicated layer genuinely earns its place: when the native tooling is not enough for the client's actual risk — a law firm, an accountancy practice, anyone whose mail is worth intercepting. When you deliberately want filtering from a different vendor than the mailbox, so a gap or an outage in one is not automatically a gap in the other. When you need archiving with retention independent of the mail platform, which Microsoft's own retention does not fully replace and which is frequently the requirement that actually drives the purchase. And — for an MSP specifically — when you want one console across thirty client tenants rather than administering thirty Microsoft admin centres separately. That last reason is often the real one, and it is entirely legitimate: the operational saving is genuine even when the detection difference is modest. Why we lead with this: an email security layer sold to a client who did not need one is a line on an invoice that will be questioned at renewal, and rightly. Selling it where it is warranted, and being able to explain exactly why, is a better business than selling it everywhere. The value: a capable layer, worth buying for specific and statable reasons. TechBag helps you work out which of your clients actually need one — and which need their existing licence configured properly instead.
Collective intelligence — what it is genuinely good at
The mechanism behind Mail Assure's filtering is worth understanding precisely, because it explains both where the product is strong and where it is ordinary. How it works: threat data is pooled across the entire customer base. When a campaign is seen against one customer, the signal informs filtering for every other customer within minutes. The larger the base, the faster and broader that learning. Where it is genuinely strong: volume attacks, which are the overwhelming majority of what arrives. A phishing campaign sent to fifty thousand addresses hits a handful of customers first, and those first few effectively vaccinate everyone else. Against mass campaigns, credential harvesting at scale and commodity malware, this model works well and works fast — faster than approaches that wait for a signature or a sample to be analysed centrally. Where it is less differentiating, stated plainly: a targeted attack written for one organisation. If a message is crafted for your client's finance director, referencing a real transaction, sent from a lookalike domain registered last week, there is no prior sighting to learn from — because your client is the first and only target. Collective intelligence has nothing collective to draw on. That is not a flaw in the implementation; it is a property of the approach, and it is why products taking a behavioural approach — Abnormal AI most notably — exist and why Proofpoint and Mimecast invest heavily in targeted-attack detection. What follows for you: if your clients' realistic threat is volume, this model is well matched and good value. If you have clients who are plausible targets for a bespoke attack — legal, financial services, anyone handling large payments — look seriously at products built for that, and expect to pay more. The value: a mechanism that is genuinely fast against the bulk of real-world email threat, with an honest account of what it does not address. TechBag helps you match the product to the actual threat profile per client rather than buying one answer for everyone.
Archiving is often the reason, and it is a good one
The email security conversation usually starts with threats and ends up being about retention, and archiving deserves more attention than it typically gets in an evaluation. What archiving actually solves: retention obligations that arrive from regulation and contract rather than from security. A regulator, a client contract or a legal hold requires that mail be retained for a defined period and be retrievable. Those obligations persist long after a mailbox is deleted, an employee leaves, or a client changes mail platform — and mailbox retention is not the same thing as an archive, because a mailbox can be deleted, a tenant can be migrated, and retention policies can be changed by anyone with the right admin rights. What Mail Assure provides: archiving with retention independent of the mail platform, plus search and retrieval for when legal, regulatory or HR needs a message. The independence is the point — the archive survives events that would take the mailbox with it. Why it frequently closes the deal: security is a probabilistic argument that is hard to prove value on. Retention is a binary requirement: either you can produce the message or you cannot, and when you cannot the consequence is immediate and attributable. Clients who hesitate over filtering often sign for archiving without argument, because their auditor or their contract made the decision for them. What to test rather than assume: retrieval speed and search quality, not just that retention is configured. An archive you cannot search quickly is a compliance liability rather than an asset — the requirement is usually 'produce these messages by Friday', not 'store these messages'. Run a real retrieval during the trial. The value: platform-independent retention with search, often the requirement that actually justifies the purchase. TechBag helps you set retention against the actual regulatory and contractual obligations rather than a default.
One console across thirty tenants — the real MSP argument
For an MSP the strongest case for Mail Assure is often operational rather than technical, and it is worth stating openly rather than dressing it as a detection advantage. The problem it solves: an MSP with thirty clients on Microsoft 365 administers email security in thirty separate Microsoft admin centres. Each has its own policies, its own quarantine, its own reporting, and its own drift away from whatever standard you intended. Checking quarantine across thirty tenants is thirty logins. Rolling out a policy change is thirty repetitions of the same work. Producing a monthly report for each client is thirty exports. None of this is difficult; all of it is time, and it scales linearly with your client count in exactly the way an MSP cannot afford. What Mail Assure provides: filtering, continuity and archiving administered across every client from one console. Policy applied consistently, quarantine reviewed in one place, reporting produced per client without thirty separate exercises. Onboarding a new client is a configuration rather than a project. Why this is a legitimate reason to buy even when detection is comparable: the operational saving is real, measurable and recurring, while the detection difference between competent products is often marginal for a typical client's threat profile. An MSP buying for administrative consolidation is making a sound commercial decision, not settling. The honest note: this argument weakens if you have very few clients, or if your clients' tenants are heterogeneous enough that you cannot apply consistent policy anyway. And it is worth pricing against the alternative of using Microsoft's own multi-tenant management, which has improved and may be adequate depending on your licensing. The value: administrative consolidation across many client tenants, which for an MSP is frequently the whole business case. TechBag prices that saving against the licence cost so the decision is made on numbers.
The honest scope
Mail Assure is N-able's cloud email security product: inbound and outbound filtering driven by threat data pooled across the customer base, quarantine with end-user control, continuity when the mail platform is unavailable, and long-term archiving with search — all administered across every client from one console. Where it genuinely wins: administrative consolidation for an MSP running many client tenants, which is frequently the real business case; speed against volume attacks, where pooled intelligence works well; archiving with platform-independent retention, which often closes the deal; and adjacency to an N-able stack you already run. Where a competitor fits better, plainly: Proofpoint and Mimecast are deeper against sophisticated targeted attacks and priced accordingly — if you have clients who are plausible targets for a bespoke attack, look seriously at them. Abnormal AI takes a behavioural approach that is genuinely different in kind and strong precisely where collective intelligence is weakest. And Microsoft's own Defender for Office 365, which higher M365 tiers already include, may be sufficient for many clients — check what they already own before selling them anything, because a layer sold to a client who did not need one gets questioned at renewal, rightly. The limits to weigh: collective intelligence is less differentiating against targeted attacks with no prior sighting; this is not the deepest email security product on the market and we would not claim otherwise; pricing is quote-only and it is a separate product from the RMM; where mail and archive data rest needs establishing in writing, which matters more than usual because an email archive contains years of correspondence including personal data under the DPDP Act; and N-able grew about 6 percent and cut roughly 6 percent of its workforce in July 2026. So the honest positioning: for an MSP wanting competent email security and archiving across many client tenants from one console, alongside a stack it already runs, Mail Assure is well-judged and fairly priced. For a client facing genuinely targeted attacks, buy something built for that. TechBag scopes both, in INR with GST.
The numbers behind the platform
What your Mail Assure evaluation looks like
Audit what your clients already own
Before evaluating anything: which M365 tier is each client on, and does it already include Defender for Office 365? A surprising number of organisations own capable filtering they have never configured. If the answer is that the licence covers it, the honest recommendation may be to configure what they have rather than sell them a layer.
Trial on a real client tenant
Thirty days on a genuine tenant rather than a test one, so you see real mail and real false positives. Check quarantine handling and end-user digests specifically — how much support load an email layer creates is decided by whether users can release their own mail or must raise a ticket.
Test retrieval, and test outbound
Run a real archive search — 'produce these messages from eighteen months ago' — and time it, because retrieval is the requirement, not retention. Then confirm outbound filtering is configured, which evaluations focused on inbound routinely skip and which is what limits the damage from a compromised account.
Report the value, per client
Produce the per-client filtering report monthly. An email security line on an invoice gets questioned at renewal unless the client can see what it caught. TechBag helps set retention against actual obligations and invoices in INR with GST.
The review scoreboard
Modelled on Gartner Peer Insights structure. *Counts and breakdowns are illustrative pending verified review collection.
Quick poll — what’s driving your evaluation?
Talk to an advisor“Thirty clients meant thirty Microsoft admin centres. One console for filtering and archiving across all of them was the entire business case, and it paid for itself in reclaimed hours.”
“Archiving closed the deal, not the filtering. Our client's regulator asked for retention we could evidence, and mailbox retention was not the same thing.”
“Continuity earned its keep during a platform outage. Our client kept sending mail while everyone else's provider was down, and that is what they remember about us.”
“Honest: for our law-firm client we moved to a product built for targeted attacks. Pooled intelligence is fast against volume and has nothing to learn from when your client is the only target. TechBag said so up front.”
“TechBag checked what our clients already had in their M365 licences before selling us anything. Two of them already owned Defender for Office and had never turned it on properly.”
“Test archive RETRIEVAL, not just retention. The requirement is always 'produce these by Friday', never 'store these'. We ran a real search during the trial.”
“Outbound filtering is the part people forget to evaluate. A compromised client account sending to their own customers is a reputational problem, not just a security one.”
“An email archive is years of correspondence including personal data. We got the storage region in writing before signing, which our regulated client later asked about.”
Where everyone sits — the grids
Analyst firms bury this view behind paywalls, and G2 retired its Grid. So here’s TechBag’s synthesis of the email security market — tap any vendor to see why it sits where it does.
TechBag Email Security Grid
Execution strength vs product vision — the classic market map, minus the paywall.
MSP-oriented filtering and archiving. This page's product.
Detection depth × Operational fit
The grid nobody publishes — how strong the detection is vs how well it fits an MSP practice.
Good and straightforward; strongest on multi-tenant admin.
Positions are TechBag’s illustrative synthesis of public review-platform data and vendor documentation — not a reproduction of any analyst graphic. Verify before relying on it.
Mail Assure vs the email-security field
Proofpoint, Mimecast, Abnormal AI, Defender for Office and Sophos Email — honest lanes. The edge here is multi-tenant administration and included archiving. Facing genuinely targeted attacks? Proofpoint or Abnormal go deeper, and we sell them.
| Dimension | Mail Assure | Proofpoint | Mimecast | Abnormal AI | Defender for Office | Sophos Email |
|---|---|---|---|---|---|---|
| Position | MSP-oriented filtering + archiving | The enterprise depth leader | Deep filtering + archiving | Behavioural, targeted-attack focused | Native, in higher M365 tiers | Email inside a security portfolio |
| Volume-attack filtering | Strong — pooled intelligence | Strong | Strong | Strong | Competent | Strong |
| Targeted-attack detection | The honest limit — no prior sighting | Deep investment here | Strong | Behavioural — built for exactly this | Better at higher tiers | Strong |
| Archiving included | Yes — platform-independent | Separate | Yes — a core strength | No | Via M365 retention | Separate |
| Multi-tenant MSP console | Yes — the real business case | Enterprise-leaning | Enterprise-leaning | Improving | Via partner tooling | Yes (Sophos Central) |
| Continuity | Yes | Available | Yes — well regarded | No | No | Available |
| Best fit | MSPs wanting filtering + archiving across many tenants | Enterprises facing sophisticated targeted attack | When archiving depth is the requirement | When targeted attack is THE threat | When the client already owns a higher M365 tier | Inside a Sophos security portfolio |
Which cybersecurity approach fits you?
Honest fit signals — because the fastest way to lose your trust is to pretend one product wins every scenario.
Choose Mail Assure if…
- ✓You are an MSP administering email security across many client tenants and want ONE console instead of thirty admin centres
- ✓You need archiving with retention independent of the mail platform — often the requirement that actually drives the purchase
- ✓You want continuity so a platform outage is degraded rather than total
- ✓Your clients' realistic threat is volume attacks, where pooled intelligence works fast and well
Proofpoint or Mimecast if…
- ✓Your client is a plausible target for a bespoke attack — legal, financial services, anyone handling large payments. Deeper here, and priced accordingly
Abnormal AI if…
- ✓Targeted attack is THE threat — a behavioural approach that is strong precisely where collective intelligence has nothing to learn from
Nothing at all if…
- ✓Your client already owns Defender for Office 365 in a higher M365 tier and has never configured it. Check what they have before selling them anything — we will tell you when that is the answer
Mail Assure is one of 22 email security products TechBag carries. The Email Security guide narrows them to a shortlist and shows the reasoning. →
What do email threats cost you?
Drag the sliders (client-tenant count; IT hourly cost as a loaded rate). Estimates contrast administering email security tenant by tenant — quarantine checked in each, policy applied repeatedly, reporting exported separately — against one console across all of them, plus the outage time continuity converts from total to degraded. NB: this models ADMINISTRATIVE saving, not detection difference. If your client faces targeted attack, a deeper product is worth its price and this model does not capture that. Illustrative.
Loaded cost = salary + overheads per productive hour. Illustrative only — your TechBag quote models your actual environment and modules.
Three ways to consume it
Quote-only, and a SEPARATE product from the N-central and N-sight RMM platforms, Cove and the security line — commonly bundled into one quote, so price the whole basket rather than the line. What to establish beyond the number: whether archiving is included or an add-on and how retention beyond the standard window is charged; how continuity is priced; and per-seat versus per-domain counting across your client base. Check first whether your client's existing M365 tier already includes Defender for Office — sometimes the honest answer is to configure what they own. TechBag obtains the quote and invoices in INR with GST.
Mail Assure
Best across many client tenants
- QUOTE-ONLY — no published rate card
- Filtering (both directions), continuity AND archiving in one product
- One console across every client — often the real business case
+ Platform add-ons
Best for a broader rollout
- Scoped to your estate
- Add-on modules as needed
- Phased, right-sized deployment
+ check what they own first
Best before you sell anything
- Higher M365 tiers already include Defender for Office 365
- Many clients own capable filtering and have never configured it
- TechBag audits the licences before recommending a layer
Buy it for less — TechBag pricing beats list
Whatever the list prices above, TechBag negotiates a significantly better deal — with GST-compliant INR invoicing and local support. Ask us for your discounted quote.
Get an India-ready quote
Tell us your requirements and current tools — we’ll model it against what you spend today.
The 8 questions to ask every vendor
Take this into your next vendor call — including ours.
Which M365 tier is each client on, and does it include Defender for Office 365? Selling a layer to a client who already owns one is a renewal conversation you will lose.
Is your client facing volume attacks or targeted ones? Pooled intelligence is fast against volume and has no prior sighting to learn from when your client is the only target.
Did you run a REAL archive search and time it? The requirement is 'produce these by Friday', not 'store these'. An archive you cannot search is a liability.
Is outbound configured? A compromised client account mailing their own customers is a reputational problem, and inbound-focused evaluations skip this.
Can end users release their own false positives, or does each one become a ticket? This decides how much support load the layer creates.
How many client tenants would this consolidate? For an MSP that administrative saving is often the whole business case — price it explicitly.
What retention do regulation and client contracts actually require? Set it against those rather than a default, and remember mailbox retention is not an archive.
An email archive is years of correspondence including personal data under the DPDP Act. Have you got the storage region in writing?
Questions buyers ask
Ready to find out which clients actually need this?
Start with the licence audit — which M365 tier is each client on, and do they already own Defender for Office 365? Then trial Mail Assure on a real tenant, run a genuine archive retrieval, and confirm outbound filtering is configured. Or let a TechBag advisor run that audit and scope it honestly against Proofpoint, Mimecast and Abnormal, which we also sell.
Stats, ratings, review counts and pricing are illustrative and sourced from public materials; verify before purchase.