Exchange SBS 2003. Issues sending external mail
Posted on 2014-01-02
Hello, I've been having some difficulties with our Exchange server on SBS 2003. We finally resolved the issue we'd been having with receiving external emails and our Exchange was fully working as of last week. However, upon returning this week we found that we could no longer send emails to external sources. The errors we have been receiving, for all email accounts through both telnet and outlook, are 501 5.5.4 or 550 5.7.1 when we try to send mail. This effects all users.
I have spent the last week trying to figure out what may have caused this and have looked at all the usual solutions for this error, with no luck. Our SMTP connectors appear fine. I've tried adding a new recipient policy. I've disabled our anti virus software. Our firewalls have both been disabled (temporarily) and the problem still occurred.
If anyone has any ideas, I would really appreciate it. Thanks.