One of the things I have noticed recently is that many legitimate email servers have changed the 220 message to include a bit of legalize
RSP: 220-AOL and its affiliated companies do not
RSP: 220-authorize the use of its proprietary computers and computer
RSP: 220-networks to accept, transmit, or distribute unsolicited bulk
RSP: 220-e-mail sent from the internet.
RSP: 220-Effective immediately:
RSP: 220-AOL may no longer accept connections from IP addresses
RSP: 220 which no do not have reverse-DNS (PTR records) assigned.
Is this something that is possible? That happens to be the one AOL is currently using. There are several others that have done similar.