Exchange 2007 Recieve Mail Issues
Posted on 2010-01-07
I've been having trouble receiving any external mail recently to my SBS 2008 Exchange 2007 box. The error I get when users try to send external mail to my domain is:
firstname.lastname@example.org on 1/6/2010 11:51 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<mail.theirserver.com #5.7.1 smtp;550 5.7.1 Recipient rejected (R4)>
If I run the mail flow troubleshooter included with Exchange 2007, I get these errors:
IPv6 Protocol Not Supported
Exchange Server is not capable of supporting Internet Protocol Version 6
Now for the extremely interesting/vexing part. If i telnet directly to the server (even from an external place), do a EHLO, MAIL FROM:, RCPT TO:, and DATA (filling in the corresponding fields properly with random things), mail is delivered successfully, every time, without issue. However, if I try to send mail from Outlook (with an e-mail account belonging to an Exchange 2003 server), or even Thunderbird (with an account belonging to Qmail), i get the error stated above.
I've never seen anything like this, and am highly confused. My DNS MX/A host records are correct on our domain registrar as well.
I have not a clue what to do about this, and I really would not like to re-install Exchange 2007 on a brand new install of 2008 (this is an HP ML150 G6 that I deployed no more than two months ago).
Any help is appreciated, and thanks in advance.