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?
I like having one ALPN identifier rather than four, since it requires a
smaller change to email clients that share/reuse code for using TLS within
In my code it's just some "context" that is passed to the proper
functions. The "main" problem is to select the right context, esp.
if things are highly configurable (some people might want to run
smtps on a different port).
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