What does this bounce error mean: "550 IP Authorization check failed - psmtp"

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Under "EMAIL REPORTS" I see some emails bouncing with the reason "550 IP Authorization check failed - psmtp". What does that mean?

Some emails to those same email addresses do not bounce, but some do.

I ran the offending email through http://isnotspam.com by sending it BCC to check@isnotspam.com and the report looks clean:

SPF Check : pass
Sender-ID Check : neutral
DomainKeys Check : pass
DKIM Check : pass
SpamAssassin Check : ham

I posted the full report here: http://sandbox.kendsnyder.com/sendgri...

Any ideas on what I can do to avoid the bounces?
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ken

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Posted 4 years ago

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ken

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SOLVED!

We found that Google's Postini mail service returns this error when you try to send mail From one of it's mailboxes. So if Google Postini is running on example.com, mail from the outside that has a from header of me@example.com will get rejected.

Unfortunately, it appears that rejection at this level does not leave any trace on the Postini side. The email is not held in a spam folder and delivery failure does not appear on any log.

The solution is to always put From as an email on your own domain, and use Reply-To instead.

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