Ken A wrote:
Can be a probe too. Accepting mail from that IP with that content says something about your system. Spammers aren't stupid. They fingerprint us just like we fingerprint them.
If I was a spammer, I don't see why I would probe you. I understand if it's filter poisoning, but probing to see if the message will be accepted is useless. they can just send their spam. if you reject it, others will accept it, and some will read it, which is exactly what they want to achieve.
