Wietse Venema writes:
The submission service (port 587) requires authentication. The
ssmtp service (port 465) requires a protocol that has been deprecated
for years, and that is not even implemented in the Postfix SMTP
client.
So that kills off the STANDARD mail ports.
Ah, that's clear. Thank you.
That is true, yes. I know it can be done this way, but what I am looking
for is a generic solution that tries delivery on port 25 first, and on port
n next. The goal is to prevent the requirement of configuring each client
separately.
That is a mistake.
You can't simply assume that all your customers will accept mail
on some NON-STANDARD port number. This requires prior arrangements,
plus a transport map entry.
Well, we can make those arrangements, because we're the ones
maintaining their servers.
I'll use the transport map.
Thanks for your answers,
roel
