I'm using Postfix 2.5.1 on Ubuntu Server x64 8.04 LTS. I am attempting to use Postfix to relay non-local mail from my home network to ATT U-verse's SMTP server at smtp.att.yahoo.com:465.
As recommended at the Postfix website (and elsewhere), I set up an stunnel client connection from my server (on localhost:2525) to the ATT server. Since ATT requires per-user authentication for outgoing mail, I turned on sender-dependent authentication and created a password map containing the authentication information for each user. The map looks like this: a...@att.net a...@att.net:abcpassword x...@att.net x...@att.net:xyzpassword I also have generic mapping turned on, with a generic map that looks like this: a...@local.net a...@att.net b...@local.net x...@att.net Finally, I set Postfix's relayhost to [localhost]:2525. So far, so good. Here's the problem: everything works fine when I configure the From address in the user's e-mail client to the user's ATT address, e.g., a...@att.net. When, however, I configure the From address to the user's local address, e.g., a...@local.net, that address doesn't get rewritten by the generic map. This causes authentication to fail because the password map lookup, which uses the ATT address as a key, fails. Whatever data Postfix returns for a failed password lookup is sent to the ATT server, and it, of course, rejects the authentication attempt. I'm curious as to why the generic map isn't working for mail sent to the relayhost. I suspect it has something to do with the fact that the stunnel connection (on localhost) is within $mydestination, and, hence, considered to be a local destination by the generic mapper (even though its designated as the relayhost). Also, I'm unclear about the order in which rewriting and password lookup take place. My gut feeling is that rewriting occurs before the lookup, so that the password lookup needs the ATT address as the key. Any insight on these issues would be greatly appreciated. TIA, Jack Browning
