Don’t send from hotmail if you can help it. I don’t know why my spam filter
thought the header was forged (for all I know it was perfectly genuine) but I
suspect (some of?) the hotmail gateways assign random IP addresses, without
having an actual host with that address.
Also have an address without numbers if at all possible. The “likely spammer
email” mentioned below was of the type “name2006”. This only got 0.4 points,
but it was the straw that broke the camel’s back.
If you can’t help sending from hotmail (for instance, as in this case,
because your message is the change-of-address from hotmail to something else…)
try to make it send plain text. My antispam software is very
suspicious of HTML. I’ve already deleted my own filters that throw away all
HTML to get rid of some of the false positives, but SpamAssassin is diligent.
I don’t know the reason for the 40% to 60% Bayesian spam probability. Perhaps
because there was very little text, only “Hi, my old address is X, my new
address is Y, thanks”. But that didn’t give any points, so never mind.
Content analysis details: (5.4 points, 5.0 required)
pts rule name description
---- ---------------------- ------------
3.0 FORGED_HOTMAIL_RCVD Forged hotmail.com 'Received:' header found
0.4 MAILTO_TO_SPAM_ADDR URI: Includes a link to a likely spammer email
2.0 HTML_MESSAGE BODY: HTML included in message
0.0 BAYES_50 BODY: Bayesian spam probability is 40 to 60%
[score: 0.5070]
I did catch this one, but I can’t guarantee that I always will. I have
SpamAssassin and the filters to avoid having to see every single message
that comes in.