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Emails bouncing

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?

Reply to
jasonconstance
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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
Reply to
Ansgar -59cobalt- Wiechers

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