Hi,
I've been modding other plugins and am scheming to write a plugin that does the
following.
1. mail passes the usual plugins tests
2. Generate an MD5 signature on the body and title.
3. Check for the md5 signature in a db. If it finds one, accept the mail. If
it doesn't reject the mail.
The general idea being, more legitimate mail will retry. I have some questions.
A. Should I even bother? I'm not enough of an admin to know if this would be a
worthwhile endeavor. This may be exploited by spammers already.
B. Do more experienced admins have some advice on timestamp logic. A total
shot in the dark is about an hour between the first send and the second
accepted send.
C. Does qpsmtpd have a way to easily call envelope timestamps?
Naturally, there's some simple logic to flush the signature DB with signatures
maybe 24 hours old. That's a simple cron job.
Any suggestions are welcome.
Michael
