554 5.7.1 Message cannot be accepted, spam rejection

SMTP Error Code

Message is probably spam. If you think this message is not spam (false positive), try to alter the configuration of the anti-spam engine, index the message by Bayesian or create a whitelist entry.
 
Message deleted by filter. Alter your content filters configuration.
 
Message challenged by filter. If you do not want to use Challenge Response, you can deactivate it in your anti-spam settings (Trust tab in older versions, now Quarantine node).

Applies To

SMTP Error Code

See Also