I found that when I put the string http:\\stoppoliticalcalls.org/index.php (which I neither recommend nor suspect of anything) into the text of a text email it fails with an SMPT server rejection. I tried lots of permutations. At first I was thinking that the rejection was due to some other content. It took a while to figure out what it found offensive. It turned out that it was the "/index.php" part. That surprises me. So redcross.org/index.php in the text gave the same rejection (that page does not exist).
The rejection is
Error reported by server: 554 Transaction failed : Cannot send message due to possible abuse; please visit http://postmaster.yahoo.com/abuse_smtp.html for more information.
Visiting the cited URL does not give a clue, but seems to just be a generic mail help page.
Mystery solved. Comments?
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