It appears that Claus Assmann <ietf-smtp(_at_)ietf(_dot_)org> said:
On Thu, Jul 29, 2021, Arnt Gulbrandsen wrote:
In this case, we're talking about whether there is one different ALPN or
four. Either case suffices to protect email servers from being involved in
Since there are already IDs for IMAP and POP3, it seems we are down to
3 (+SMTP) or 4 (+SUBMIT) unless we want to break existing applications?
Given that clients often don't know whether they're talking to an SMTP or a
server, and servers don't know which one they are or maybe both, one ALPN would
It's still pretty common for a server to offer SMTP on port 25, which turns
if the client authenticates.
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