Mimecast Alternatives in 2026: Keep Engage, Add SMS, Voice and Callback

You do not have to replace Mimecast to close the gap. Most teams searching for a Mimecast alternative are not unhappy with Engage. They have found that their program stops where email stops.

One scoping note first. Mimecast is a large product family, and Keepnet is not an alternative to most of it. The secure email gateway, archiving, data retention and DMARC analysis sit outside what Keepnet does, and if you run them there is no reason to change. This comparison covers one module of that family: Mimecast Engage, the security awareness training and phishing simulation product.

The question that brings people here is narrow. Where do the attacks that never arrive by email get tested, and where do they get reported?

What Does Mimecast Engage Do Well?

Engage is built around risk scoring, and that is a real strength. The Human Risk Command Center assigns training from an individual risk score, and Watchlist Manager regroups people as that score moves. If your program needs a defensible answer to who is risky and why, Engage gives you one.

SAFE Phish is the second. A real campaign that reached your organisation can be de-weaponised and turned into a simulation, so the test uses the lure your people actually received instead of a generic template. Engage also ships an AI template generator and more than 200 training modules in 27 languages.

On channels, be precise. Engage runs email simulations and can place a QR code inside an email template, reporting scans separately from clicks. That is QR inside the email, which is useful, but it is not a separate channel.

Why Teams Look for a Mimecast Alternative

Three reasons come up most often.

The simulation stops at email. Engage describes an email arriving in the inbox. A text message sent to an employee phone, a call placed to their number, a callback number they dial, an MFA prompt they approve, a synthetic voice in a meeting: none of these appear as simulated channels.

That matters because the untested channel is the one people fail more often. In the 2026 Verizon Data Breach Investigations Report, the median click rate is about 1.4 percent on email simulations and about 2 percent on phone-centric ones (Verizon, 2026 Data Breach Investigations Report, 2026, p. 50).

Reporting lives in Outlook. The reporting path runs through a desktop add-in. When the suspicious message is an SMS or a missed call, there is no button on the device where it landed, so the incident ends as a screenshot in a chat window or never reaches the security team at all.

The strongest features assume the rest of the stack. SAFE Phish works because Mimecast already sees your mail flow. If you do not run the Mimecast gateway, or you plan to move off it, that advantage weakens with it.

How Keepnet Is Different

Keepnet runs simulations on six channels from one platform: email, voice, SMS, QR, callback and deepfake. Each channel produces its own susceptibility report, so a team that looks strong on email can still see where it is not.

Voice simulations place an actual call to the employee own phone, from one of your local numbers, with a two way AI conversation rather than a recording. See vishing simulation.

SMS and QR simulations reach the device directly, and each is measured on its own. See smishing simulation and quishing simulation.

Callback phishing is its own channel. The employee dials the number and speaks to an agent, and what happens after the dial is measured rather than assumed. See callback phishing simulation.

Your Mimecast gateway can be tested as well. Email Threat Simulator sends benign versions of current attacks through your existing controls and reports what got through. That is a measurement of the gateway, not a replacement for it.

Every product can be bought on its own. The full platform is optional, so a team that only needs the phone channel can start there and keep Engage doing email.

The platform is SCORM compatible, so training content you already licence runs inside your own LMS with tracking intact.

Employees can report a suspicious SMS or call from the phone itself. Keepnet Reporter puts the report button where the attack actually lands, and the report joins the same pipeline as email reports.

Keepnet vs Mimecast Engage: What to Compare

Keepnet compared with Mimecast Engage

Can You Run Keepnet Alongside Mimecast?

Yes, and for Mimecast accounts this is usually the sensible order. Keep the gateway and Engage where they are, add the channels that are not being tested, and compare the numbers after one cycle. Nothing has to be switched off for that comparison to be fair.

Which Mimecast Alternative Fits Your Reason?

If the reason is the phone, look for a platform that places a real call and sends a real text, and that reports each channel separately. A phone number inside an email is not a phone simulation.

If the reason is reporting, ask where an employee reports a suspicious SMS or a missed call, and whether that report reaches the same queue as email reports.

If the reason is stack independence, check which capabilities survive if you change your email gateway next year, and which ones quietly depend on it.

If the reason is content, be honest that Engage has a large library. Ask instead whether the content can be adapted by role, language and region, and whether it runs in the LMS you already own.

See It on Your Own Environment

The fastest way to compare is a short pilot on the channel you are not testing today. One voice campaign and one SMS campaign on a small group will tell you more than any feature table, including this one. Book a demo and we will set it up on your own users.

For a wider view, see our comparison of security awareness training platforms, the Proofpoint and KnowBe4 comparisons, and the mobile phishing visibility gap whitepaper.