Lets say you configure Mail.app to send mail pretending to be from your hotmail account. When Mail.app connects to your SMTP server it takes your From address, strips off everything before and including the '@' sign, and declares itself:
EHLO hotmail.comDumb dumb dumb.
And besides, does anybody do anything useful with the HELO/EHLO command?
-Dom
Re:But...
ask on 2003-04-10T23:17:15
One useful thing is to reject mail if the connection was introduced with (EHLO|HELO) hotmail.com or aol.com. (Because those services never introduce themselves that way).
- ask
Re:How did you find out?
Matts on 2003-04-11T06:58:47
I use Ask's qpsmtpd. I saw it in the logs. Might be worth trying it just so you can see potential changes in the envelope.