I'm pretty new to configuring mail servers, and I'm running into issues trying to get outbound mail to work. I've configured Postfix to (I think) request smtp auth at my ISP's mail server in an attempt to get him to relay my mail, but I'm not sure the authentication attempt is happening. A few background items... 1) PPPoE DSL connection, dynamic IP. 2) DynDNS/ddclient correctly working to keep domain name and IP address in sync. 3) Postfix on home LAN server correctly configured to send and receive internal mail. I send a message from root@xxxxxxxxxxxx to jcliburn@xxxxxxxxxxxx The ISP's mail server unceremoniously bounces it thusly. Apr 10 12:17:34 osprey postfix/pickup[4586]: B48F46CE549: uid=0 from=<root> Apr 10 12:17:34 osprey postfix/cleanup[4622]: B48F46CE549: message-id=<20060410171734.B48F46CE549@xxxxxxxxxxxxxxxxxxx> Apr 10 12:17:34 osprey postfix/qmgr[4587]: B48F46CE549: from=<root@xxxxxxxxxxxx>, size=313, nrcpt=1 (queue active) Apr 10 12:17:40 osprey postfix/smtp[4624]: B48F46CE549: to=<jcliburn@xxxxxxxxx>, relay=mx00.mail.bellsouth.net[205.152.58.32], delay=6, status=bounced (host mx00.mail.bellsouth.net[205.152.58.32] said: 550 relaying mail to gmail.com is not allowed (in reply to RCPT TO command)) Apr 10 12:17:40 osprey postfix/cleanup[4622]: 5E98B6CE563: message-id=<20060410171740.5E98B6CE563@xxxxxxxxxxxxxxxxxxx> Apr 10 12:17:40 osprey postfix/qmgr[4587]: B48F46CE549: removed Apr 10 12:17:40 osprey postfix/qmgr[4587]: 5E98B6CE563: from=<>, size=2187, nrcpt=1 (queue active) Apr 10 12:17:40 osprey postfix/smtp[4624]: 5E98B6CE563: to=<root@xxxxxxxxxxxx>, relay=mx01.mail.bellsouth.net[205.152.58.33], delay=0, status=bounced (host mx01.mail.bellsouth.net[205.152.58.33] said: 550 relaying mail to hogchain.net is not allowed (in reply to RCPT TO command)) Apr 10 12:17:40 osprey postfix/qmgr[4587]: 5E98B6CE563: removed I know the server is saying "relaying mail to [wherever] is not allowed," but does that mean not allowed at all, or not allowed without smtp authentication? So, hoping it's the latter, I setup smtp auth on my postfix, reasoning that if the ISP requires authentication whenever I fetch my personal email from him (using a client like thunderbird), then maybe he requires an authentication before he'll relay. But it doesn't help. I still get bounced. Interestingly, here's a telnet session with the ISP's mailserver: [root@osprey ~]# telnet 205.152.58.33 25 Trying 205.152.58.33... Connected to 205.152.58.33. Escape character is '^]'. 220 ibm30aec.bellsouth.net ESMTP server ready Mon, 10 Apr 2006 13:28:30 -0400 EHLO bellsouth.net 250-ibm30aec.bellsouth.net 250-HELP 250-PIPELINING 250-DSN 250-8BITMIME 250 SIZE 26214400 AUTH PLAIN <<<base64-encoded-username/password>>> 502 Command is locally disabled quit 221 ibm30aec.bellsouth.net ESMTP server closing connection Connection closed by foreign host. What does the response "Command is locally disabled" mean? I'm confused by it, because the ISP requires that I authenticate when I check my personal mail. How could the AUTH command be disabled at his end in this case? I'm missing something really fundamental. Any hints or pointers appreciated. Thanks, Jay
