Emails bouncing

Oct 19, 2006 1 Replies
J

Hello all!



I've recently had several emails coming INBOUND to my network bouncing back to their senders. The senders are getting a 550 5.7.1 ... relaying denied.



I'm also getting reports from alot of users getting the message when sending mail OUTBOUND:



You do not have permission to send to this recipient. For assistance, contact your system administrator. 550 5.7.1 IP must resolve.


I'm running a watchguard III firebox on the perimeter, as well as a barracuda spam firewall 300. My mail server is an Exchange 2003 server.



I've also noticed some problems pop up when running a report on dnsreport.com.



Can anyone give me some help with this problem?



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A

That's not bouncing but your MX rejecting mail. A bounce is created when your MX first accepts the mail and later in the delivery process decides to drop it and send an NDR to what *appears* to be the sender.

What do your mailserver logs say? Does the recipient for those mails exist?

Looks like your outbound SMTP server needs a PTR record in DNS.

However, neither of these problems is firewall-related.

cu

59cobalt
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