SPF Problems and Postini Rejection

Tech Supporton April 11th, 2012No Comments

We had a client that suddenly started having problems sending to a domain that they had previously sent emails to with no problems. Both domains use Postini, so we thought that might be an issue. The error message we were getting on bounced emails was:

Postini #550 Sender Authorization check failed – psmtp ##

It turns out the problem was with my client’s SPF record. There was a typo in the record that was causing the SPF check to fail. Correcting their SPF record fixed the problem.

The interesting thing was that this had worked before which lead us to believe that there may have been some improvements/changes to their Postini checking.

Anyhow, hope this helps someone else.

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