Hello, I am behind a firewall here at work and using Exim as my MTA. Most of the time (like 95%), I can send messages fine and they get delivered OK.
However, the other 5% of the time Exim gives me the error message: This message was created automatically by mail delivery software (Exim). A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: [EMAIL PROTECTED] SMTP error from remote mailer after MAIL FROM:<[EMAIL PROTECTED]> SIZE=4319: host ausmtp02.au.ibm.com [202.135.136.105]: 501 <[EMAIL PROTECTED]>... Sender domain must exist I understand the STMP server at the other end is trying to auth my IP address which doesn't exist since it is masqueraded - but is there a way around this? I think it has something to do with finding an external server to relay my mail but I'm not really sure how it works - can someone clear this up for me if possible. Any help would be really appreciated. Thanks, Cyrus -- Cyrus Patel - [EMAIL PROTECTED] Software Engineer Debian GNU/Linux Electronics for Imaging (EFI) (Woody) Sydney, Australia. ICQ: 50738541 http://www.cyrusp.com Mobile: +61 0402 266 731 [EMAIL PROTECTED]