Spam blockers should not mail back to the alleged spammer saying, "We didn't deliver your message, because it appeared to be spam.
The reason for this, as anyone capable of writing code that can speak SMTP ought to be able to tell you, is that return addresses can be forged.
I'm getting way too much crap all of a sudden. :( Spammers seem to have discovered my domain.
Are they challenge-response system notifications?
If so, then please do everyone the favour and reply! That will make sure that users of challenge-response systems which send mail to forged From: addresses will receive the spam that was quarantined. Don’t let them get off free by dumping crap at you just because they got spammed.
