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Also, messages relayed to the spamtrap must be either (a) direct relaying as performed by a sendmail alias, or (b) message/rfc822 attachments with no Content-Transfer-Encoding. Again, if they're not, I'll 550 them. And finally, if I can't figure out who's in control of the feed, you guessed it, 550. So try to keep the quality control up!

"Direct relaying" means the addition of only the following data:

• a new Return-Path header
• a Received header or two
• possibly some other delivery headers, like Delivery-Date or similar.
  

In other words, the existing Received header data is preserved, along with the body structure, as it was when received.