Jeffrey Walton writes:

On Sat, Apr 26, 2025 at 7:57 AM Sam Varshavchik <mr...@courier-mta.com> wrote:
>
> A brief search finds several implementations of OTP on top of SASL. There's
> your MFA for SMTP, IMAP, and POP3. You're welcome.

From RFC 9051, Section 6.2.2.  AUTHENTICATE Command,
<https://datatracker.ietf.org/doc/rfc9051/>:

      Note
      that the SASL framework allows for the creation of SASL mechanisms
      that support 2-factor authentication (2FA); however, none are
      fully ready to be recommended by this document.

RFC 9051 is IMAP, but the same applies to POP and SMTP.

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