OpenBSD 6.5 amd64
OpenSMTPD 6.5.0

port [port]
        Listen on the given port instead of the default port 25.

I wanted to confirm if service names are intended to be supported for
`listen on` option in smtpd.conf.

These result in syntax failure:

listen on lo port smtp
listen on lo port smtps

These do not:

listen on lo port 25
listen on lo port 465

This also does not:

listen on lo port submission

Found it curious that `submission` may be used in place of a port
number but not the other service names.

-- 
Darren Spruell
phatbuck...@gmail.com

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