I know this is not exactly about SA, but I can't think of a better list to
post this question and get a decent response.
I am sick of people uploading exploitable mail form scripts for spammers to
exploit. I think the best solution is to stop this at the mail server
level. I want to configure my mail server to relay to a restricted list of
email addresses and reject everything else. Then it doesn't matter what
exploitable script of the day my users upload. If their address is not on
my relay list, the mail gets discarded.
I configured sendmail to check_rcpt but since the email is coming from a
local user, it just goes ahead and relays the message no matter what
rulesets I set up. I am willing to switch to another mail server if it's
easier to achieve this. Has anyone done this before?
-r
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