Okay guys - need a solution. I need to reduce the amount of junk coming through our system.
Here's a quick outline of the problem;
1) Email gets sent to email@example.com
2) Exchange says, we don't have a firstname.lastname@example.org, lets send a bounce message.
3) Exchange sends a bounce message to the sender, who of course doesn't exist because it was spoofed, so the email sits on sendmails outgoing mail queue.
4) Times this by 25,000 and I have a problem.
Who has a script (or can send me to the right location) for sendmail that can check if the recipient email is valid in active directoy before forwarding it on?