You do have a choice if you're not concerned about the deliverability of your e-mail. Remember, the Internet remains a group of service providers/organizations/subscribers that voluntarily work together and can choose what goes in or out. And so if they decide not to receive traffic from you, for any reason at all, there's no legal requirement. If they require that all e-mail servers that want to send e-mail to them have rDNS entries then persons who want to deliver e-mail to that entity need to comply.
Frank
So can I change my SMTP greeting to be : 220-host.example.com SMTP 220-Company agrees to the following rate chart to accept mail : 220-EHLO - $5.00 220-HELO - $2.50 220-MAIL FROM:<*> - Free 220-RCPT TO:<*> - 1-5/$4.00 , 6-10/$6.00, 11-15/$8.00, 15+/$10.00 220-DATA: $.01 per character until final ".<CR>" 220-Delivery confirmation (Return-Receipt-To, X-Confirm-Reading-To, Disposition-Notification-To) - $1.50 220 Sending HELO/EHLO constitutes acceptance of this agreement Thanks, Tuc/TBOH