On 28/07/2021 14:14, Alexey Melnikov wrote:
However, ALPN seem to be intended for multiple protocols sharing the same IP/port. This doesn't seem to
apply to SMTP/SUBMIT/IMAP/POP. Or am I missing the point of ALPN?
At least one use, tangential to that RFC-suggested is protection
against malware. I am already logging rejections by an MTA on 465
of connections attempting to use a non-mail-related ALPN.
I agree that implementing such checking does not require a
formal allocation of an ALPN for mail - but allocating one
would not preclude it either.
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