> No, I'm not confusing the two. My point is that running a mail relay
> (which implies both incoming and outgoing SMTP) from a dynamic address
> range is going to limit the functionality of your mail server because
> your server will be blacklisted by subnet block. If you are running an
> incoming mail server only then you are essentially breaking the
> protocol if you cannot reliably return bounced messages, for example.
You can bounce them via your provider's SMTP server, or via any other
SMTP server who accepts your connections (e.g. via authentication).
I.e. outgoing email doesn't have to follow the same route as incoming
one, so there's really no connection between the two.
Stefan
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