I have an ISP with about 250,000 messages per day on qmail and vpopmail-4.9.10. It all works good except for the fact that I have recently had a large number of "direct" marketing sites like edirectnetwork.net going to my mx and posting 15,000 and 30,000 messages at a time to seeming random name combinations of my domains. These always seem to be excepted, and then when the user is not reachable, about %90 of them, then we bounce the messages. Now, there smtp server is slower than congress, and my qmail gets backed up with deliveries... I have bumped up the remote deliveries until memory prevents me from doing more, but there is still long mail delays because of this. My question is, Is there a way of having qmail-smtpd actually authenticate the receiver instead of excepting the message? if so, how might this be accomplished? If it is not presently able to be done, what developement would be required and how could I help it? Thanks for all thoughts. --Kelly Prescott
