I'm getting spam (thanks to NameCheap not properly cloaking my email address), and I'd like to bounce the emails back to the spammers so they think my account doesn't exist. They're not forged
From lines, they're web developers who are spamming me looking for work.
I'm an advanced Linux user with my own mail server. Is there some way I can take their message file and tell postfix to bounce it back saying "user does not exist"? Or even if there's some script I can run on Linux or my Mac that doesn't require postfix, that's fine too. Sadly, Mac Mail removed the bounce feature, and apparently you can't even script it anymore in AppleScript like you used to be able to do.
EDIT: Just to be clear, I am specifically looking into how to bounce an email. I don't need any tips on setting up anti-spam, as I already have SpamAssassin, Amavis, and greylistd set up. These services do nothing against real people sending unsolicited email.