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8.7

"SPF unauthorized mail is prohibited" error on OUTGOING messages

Asked by NotifyNcc in Exchange Email Server, Message Queue, Simple Mail Transfer Protocol (SMTP)

Tags: spf, exchange, mail, smtp

My users are receiving the below error message when sending to a few specific outside recipients. This happens consistently with these recipients. The odd thing is that these messages appear to be generated by our Exchange server and happen immediately - in other words, our server is rejecting the message, not the target server. They are valid email addresses which the users have been successfully e-mailing for years, and can still be reached from users' outside webmail accounts (gmail etc). The messages never appear in the Exchange queue or the error logs.

I am running Exchange 2003 on a Windows Server 2003 box. There are no restrictions on user send rights aside from ones for message size and number of recipients, and all authenticated computers are authorized to relay. We use a Barracuda spam firewall, but obviously that only affects incoming mail. We do implement SPF but only on a "soft" basis (and again, that affects incoming mail).

I am at a loss as to why the 5.7.1 error references SPF at all.

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

Subject: RE: Pie chart
Sent: 8/17/2009 9:03 AM

The following recipient(s) could not be reached:

foo@bar.com on 8/17/2009 9:03 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<mail2.xyzzy.org #5.7.1 smtp;550 5.7.1 SPF unauthorized mail is prohibited.>

Get your answer NOW

20091111-EE-VQP-89 - Hierarchy / EE_QW_3_20080625

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"SPF unauthorized mail is prohibited" error on OUTGOING messages

Asked by NotifyNcc in Exchange Email Server, Message Queue, Simple Mail Transfer Protocol (SMTP)

Tags: spf, exchange, mail, smtp

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