On Fri, 2006-01-09 at 11:06 +0800, Feizhou wrote: > or grep 'postfix/smtp\[' /var/log/maillog > and look for messages related to sasl and/or sasl_passwd.db I'd already done that before, but I thought maybe the results warranted another look (after a several hour break). I'm glad you suggested the above because I now I have the relay working again! The smtp server my ISP tells its customers to use is smtp.broadband.rogers.com. When I grepped maillog, I noticed messages from Aug 30 were going out successfully like this: relay=smtp.broadband.rogers.com[206.190.36.18], delay=1, status=sent (250 ok 1156773933 qp 73034) However, messages from Aug 31 were giving this error: relay=smtp-rog.mail.yahoo2.akadns.net[206.190.36.18], delay=0, status=bounced (host smtp-rog.mail.yahoo2.akadns.net[206.190.36.18] said: 530 authentication required - for help go to http://help.yahoo.com/help/us/mail/pop/pop-11.html (in reply to MAIL FROM command)) Interesting: there's been a change at the ISP. smtp.broadband.rogers.com is now pointing to smtp-rog.mail.yahoo2.akadns.net. I changed my postfix config to include the new smtp server name, and my emails started heading out again. Yeah! I don't know enough about the process to know exactly what happened, but it looks like Postfix attempted to auth directly to the old server. When it was "forwarded" to the new server, the login failed. I'm puzzled why the manual test I performed worked using the old server name, but wouldn't with Postfix. Anyone know the details about the auth process to explain what happened? Anyway, I'm just glad it's all running again. I'm even happier that it wasn't the postfix update that messed things up. > the smtp daemons will run as postfix user and so sasl_passwd.db has to > be readable by postfix user. Actually, postfix starts as the root user, reads everything it needs to get going (including the sasl_passwd.db file), and then drops privileges to the postfix user. Thanks Chris and Feizhou for your help. I appreciated the replies very much! Regards, Ranbir -- Kanwar Ranbir Sandhu Linux 2.6.17-1.2142_FC4 i686 GNU/Linux 01:09:26 up 2 days, 18:38, 2 users, load average: 0.04, 0.18, 0.37