Matthew Seaman wrote:
DNS based blacklists are based on the senders IP address, not the forged
You need to be very careful implementing something like this. Most
Spam nowadays is bot-generated and uses forged 'From' addresses culled
from the address books on infected machines. Unless you're careful,
you're going to end up blocking a lot of completely innocent people,
or worse, blocking your own legitimate e-mail users.
email@example.com mailing list
To unsubscribe, send any mail to "[EMAIL PROTECTED]"