Ok I have recieved feedback from the Network people, and it was as I thought. It is because there is no From Address in the mails.
Quote:
7064 11:09:53.591 1 user(s) match rule - Block if 'From:' Field is Invalid
7064 11:09:53.591 ------ Category <InvalidFrom> evaluation result ------
7064 11:09:53.591 - FROM_IS_MALFORMED: (60.00) From: has a malformed address
7064 11:09:53.591 Total score: (60.0) required(60.0)
7064 11:09:53.591 ------ End of Category <InvalidFrom> evaluation ------
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So in theory the fix should be very simple. Just give it a From address
Something like
Validation@forumer.com should do
Hope this helps you guys.