Mimecast competitors: who else serves the same job
ChatGPT
Claude
Gemini
Perplexity
GrokIn brief
Mimecast competitors grouped by deployment model: MX path gateways, API connected filters, native Microsoft and Google controls, and the DMARC layer.
Mimecast's closest competitors sort into four groups by how they attach to mail. Proofpoint and Cloudflare Email Security can sit inline in the MX path, the way Mimecast's gateway does. Barracuda and Abnormal connect over an API and leave MX records alone. Microsoft Defender for Office 365 and Google Workspace controls ship with the mailbox you already pay for. DMARC platforms work on the authentication layer and replace none of the above. Which group you shop in depends on your goal: replacing Mimecast outright, or filling a gap next to it.
At a glance
Quick takeaways
- Deployment model is the first split. A gateway takes the MX record, an API connector does not, and several vendors sell both.
- Proofpoint, Barracuda, Abnormal and Cloudflare all document products that do the filtering job Mimecast's gateway does.
- Microsoft 365 and Google Workspace already filter mail for their own mailboxes, so part of the work comes with the seat.
- Microsoft publishes per-user Defender prices. Barracuda identifies a US list price, although this audit did not establish its displayed amount.
- Mimecast also sells archive, awareness training and governance products, so a filter alone is not a full swap.
- DMARC coverage varies by package: Barracuda lists reporting across its tiers, Proofpoint includes hosted authentication in Prime, and Mimecast lists DMARC Analyzer as a separate product and offers customizable plan options.
Who this comparison is for
This is for an IT team or an MSP that runs Mimecast, or has it on a shortlist, and wants the real field before a renewal conversation. It also helps when the trigger is narrower than the contract: a DMARC requirement, an archive requirement, or a mail flow change.
Cheapest is not a question published material can answer, because Mimecast shows no list price. What can be answered is which products do the same job in the same place in the mail path. The Palisade comparison hub collects the vendor pages, and the guide to email security software covers the category types in depth.
How the options were evaluated
Originally researched August 12, 2026; Mimecast delegation and packaging statements were refreshed October 13, 2026 using official sources. Reseller listings and review sites were excluded.
- Where the product attaches: the MX path, an API, or the mail platform itself.
- What the vendor publishes commercially: list prices, tier names, or sales contact language.
- Whether DMARC is inside the core package or sold beside it.
- Whether the catalogue covers archiving, awareness training and compliance review.
Source: Palisade.
Gateways that sit in the MX path
A gateway takes delivery first, so the MX records a domain publishes name whichever product holds that position. Mimecast describes its own MX based deployment as perimeter protection that blocks mail in line, with all incoming mail routing through its secure gateway before the mailbox sees it. That is the shape a direct replacement has to match, and why a swap is a cutover project rather than a settings change.
Proofpoint sells the same shape. Its Core Email Protection page lists flexible deployment via API or secure email gateway, so one product covers both paths. Its buying page names four packages, Core, Tier 2, Tier 3 and Prime, with no figure against any. It does say budgetary pricing follows user licence count and contract term, with exceptions for consumption, the most specific cost driver statement in this group.
Cloudflare Email Security can also take the inline position. Its documentation lists pre-delivery deployment through MX or inline placement as one of three options. No price appears.
Platforms that connect by API
Barracuda states that Email Protection connects to Microsoft 365 or Google Workspace with no mail exchange changes, and calls the result operational in minutes rather than weeks. Its coverage list includes phishing, malware, spam, account takeover, domain fraud with DMARC, and post-delivery weaponization. Its plans page names Advanced, Premium and Premium Plus, with no price figure.
Abnormal takes the same position. Its inbound email security page says the product deploys in 60 seconds via API with no MX changes, and describes its target as attacks with no payload, no prior signature and nothing for a rule to flag. The same page states that Abnormal with Microsoft or Google replaces a secure email gateway, which is positioning rather than a tested result.
Cloudflare belongs here too, since it also documents an API mode and a post-delivery mode using BCC and journaling. And Mimecast documents an API path of its own. Deployment model is a configuration choice as often as a vendor choice, so ruling a vendor out on that basis will mislead you.
Controls you may already own
Microsoft's Exchange Online Protection documentation states that anti-malware, anti-spam and anti-phishing filtering are included in all organizations with cloud mailboxes and on by default. The wording is blunt: you cannot turn them off, though preset or custom threat policies can override them. That baseline runs behind whatever gateway you route through.
The paid step up carries the only published per seat figure in this article. Microsoft lists Defender for Office 365 Plan 1 at $2.00 and Plan 2 at $5.00 per user per month, both paid yearly. Its plan documentation splits them: Plan 1 covers prevention and detection with Safe Attachments, Safe Links and impersonation protection, and Plan 2 adds phishing simulations, post-breach investigation, hunting and automation.
Google Workspace bundles filtering into the seat as well. Every published tier on its pricing page lists phishing and spam protection that Google states blocks more than 99.9% of attacks, while data loss prevention, S/MIME and context aware access sit under Enterprise only. If Mimecast was held for baseline filtering, some of it is already paid for.
The layer that none of these replace
DMARC authenticates mail claiming to use your domain; an inbound filter evaluates mail arriving for recipients. Mimecast’s DMARC Analyzer provides aggregate, forensic and TLS reporting, and its official 2026 announcement describes delegated SPF, DKIM and DMARC management. One-time DNS delegation and direct changes at your DNS provider are distinct workflows; confirm which applies to your account.
The pattern repeats. Proofpoint places Email Fraud Defense and hosted DMARC, DKIM and SPF in Prime, the top of its four packages. Barracuda lists DMARC reporting on its tiers. Assess the hosted authentication workflow separately from mailbox filtering. If DMARC is the reason Mimecast is under review, the Mimecast DMARC alternative page covers that narrower question.
What Mimecast sells beyond filtering
Mimecast's product index lists Advanced Email Security next to Engage Security Awareness, Incydr Data Protection, the Aware Governance and Compliance Suite, DMARC Analyzer and Email Archive. A team that bought several of those is not made whole by a filter, however well it performs.
Part of the field covers that ground and part does not. Proofpoint's product index lists Archive, Capture, Discover, Supervision and Track on the compliance side, plus ZenGuide for risk based learning. Barracuda puts cloud archiving and security awareness training in Premium Plus. Microsoft's Defender Plan 2 includes phishing simulations, and Google reserves Vault retention and eDiscovery for higher tiers. Abnormal lists AI Phishing Coach and AI Governance. Cloudflare documents filtering, and neither archiving nor training.
Where Palisade fits
Palisade is DMARC automation. It is not a gateway, it does not sit in the MX path, and it does not filter, sandbox or quarantine inbound mail, so it replaces none of the products above. Its documentation covers DMARC, SPF, DKIM, BIMI and MTA-STS, hosted records, aggregate report processing, sender classification and PSA ticketing. The agent supports sender investigation, remediation tasks and proposed DMARC policy changes; a human approves before deployment.
That is the narrow case: you keep whichever filter you land on, and the authentication work stops living in a spreadsheet. For a public read on a domain first, the Email Security Score tool reports the DMARC, SPF, DKIM, MX and MTA-STS state visible in DNS.
How to choose
Start from what triggered the review. For cost, compare the exact package, current published price where available and written quote terms. For a mail-flow constraint, evaluate the documented API paths; removing an existing gateway can still require an MX cutover. For overlap, check what Microsoft 365 or Google Workspace already runs by default. For DMARC, confirm the authentication layer and operating work independently of inbound filtering.
Then put the same questions to every vendor on the shortlist:
- Which named package and modules are in this quote, and what is excluded?
- Is DMARC in the core package, a separate product, or an add-on fee?
- Who publishes and changes the SPF, DKIM and DMARC records, us or you?
- Which deployment path carries production mail, and what is validated before cutover?
- Which archive, training and compliance modules replace the ones we use today?
- What drives renewal cost: seats, term, consumption, or repackaging?
Evidence
Sources and further reading
Questions readers ask
Frequently asked questions
Who are Mimecast's main competitors?
Proofpoint, Barracuda, Abnormal and Cloudflare Email Security all sell products that do the filtering job Mimecast's gateway does. Microsoft Defender for Office 365 and Google Workspace compete from a different angle, because their filtering attaches to the mailbox platform you already pay for.
Is there a cheaper alternative to Mimecast?
Published material does not establish that any replacement is cheaper for your scope. Microsoft publishes Defender prices. Barracuda identifies a US Email Protection Advanced list price, although its amount was not established by this audit. Compare current package-specific prices and quotes with the same users, modules, deployment and support terms.
Can Microsoft 365 replace Mimecast?
Only for part of the job. Microsoft documents anti-malware, anti-spam and anti-phishing filtering as on by default for every organization with cloud mailboxes, and Defender adds sandboxing, impersonation protection and, at Plan 2, investigation and simulation. It does not replace an archive, a compliance workflow, or DMARC records.
Do I have to change MX records to switch off Mimecast?
Not necessarily. Barracuda, Abnormal and Cloudflare document API or post-delivery deployments that need no MX change, and Mimecast and Proofpoint each document an API path beside the gateway path. An API deployment may require no MX change, but retiring Mimecast’s gateway still requires rerouting mail if your MX records currently point to it.
Does replacing Mimecast cover DMARC?
Confirm the named package rather than assume filtering includes domain authentication. Mimecast lists DMARC Analyzer as a distinct product and offers customizable bundles. Proofpoint includes Email Fraud Defense in Collaboration Security Prime. Each quote should identify hosted authentication, reporting and the party responsible for DNS changes.
Written by
Taylor TabusaCo-Founder & Head of Business Development, Palisade
Taylor Tabusa is the co-founder and Head of Business Development at Palisade, helping managed service providers turn email security into a practical, valuable service.
More from Taylor →
