[mdlug] AT&T DSL and postfix

[Dan DeSloover]

I didn't know it was possible to send directly. I thought the block was on
incoming 25 which I have had unblocked. I only use AT&T's server to relay
out because I assumed 2 things.

First that for spammy reasons and because every ISP I've ever used does it
that way outgoing SMTP was verboten.

Second that mail originating from AT&T SMTP IP address would be less
likely to be blacklisted by spamfilers.

Am I missing something?

Oh and that error occurs because when relaying outgoing mail through AT&T
you have to setup the accounts as verified senders in your Yahoo/AT&T DSL
page: