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550-Verification failed for

Asked by QGolden in Exchange Email Server, Watchguard Firewall

Tags: exchange, watchguard, firewall

We can't send email to a certain client and receive the below bounce back. The bounce back is instant

Your message did not reach some or all of the intended recipients.

Subject: FW: test
Sent: 04/11/2009 10:38

The following recipient(s) could not be reached:

'xxxxx@xxxxxx.com' on 04/11/2009 10:38
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<mail.xxxxx.com #5.5.0 smtp;550-Verification failed for <xxx@xxxx.com>>

I've been searching and have a feeling it may have something do to with our watchgurad firewall. I did do a RDNS and it said OK, although I don't know what I was looking for.

We are running W2K Server 2003, Exchange 2k3 and have a watchgurad x550e. Am I on the right track with the firewall problem or is it a DNS.

Another question is: I've xxxxx out my real domain as that seems to be what people do on forums. Why is this?

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20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

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