A login feature most mail servers built for Europe or the US never needed
SMS one-time-password login isn't a checkbox feature — it's what happens when a mail platform is actually built for a market where SMS is a more reliable second factor than an authenticator app half the user base has never installed. FanMail supports SMS OTP and 2FA at login, plus opt-in email-to-SMS notifications, as first-class features rather than a plugin bolted onto a commercial suite that assumes everyone already has TOTP set up.
Why this is a real gap, not a nice-to-have
Roll out a commercial webmail suite to 10,000 university staff and students, and a meaningful share will never complete 2FA enrollment if the only option is an authenticator app — support tickets pile up, and IT quietly disables enforcement to stop the bleeding. SMS as a first-class second factor removes that adoption cliff entirely, because everyone already knows how to receive a text.
Email-to-SMS: the other half of the same idea
Opt-in email-to-SMS notifications mean a critical message doesn't sit unread in an inbox nobody's checking outside business hours — a small feature that matters disproportionately for institutions where email still isn't everyone's primary channel yet.
The pattern underneath both features
Neither of these exists because a feature-comparison spreadsheet demanded it. Both come from FanMail being built for the market it actually runs in, not translated from one that assumes different defaults — the same reason self-hosting mattered enough to replace a $70,000/year IceWarp bill in the first place.
