At 4:27 PM -0700 9/6/06, Joe Wagner sent email regarding Why is mail
being sent to my webserver...:
Hi folks,
I confess to being a bit sleep deprived these days, but I can't
figure out why some mail servers are trying to send email to my web
server rather than the mail servers. I.e. they are trying to send to
the machine with the A record for hypertouch.com which is a
webserver rather than to hypertouch.com's mail servers which are at
other IP addresses. Now the web server is running a rudimentary
mail server but it shouldn't be getting any incoming email and so
rejects the attempts as unauthorized relays.
First off, don't run sendmail (or whatever you're running) as a
daemon. If you need to send mail from the web server, use the
sendmail stub (/usr/sbin/sendmail) to start sendmail just long enough
to send, then stop again. Don't listen on port 25. That way, they
can't send mail to the web server's address. (Even though Mac OS X
comes with postfix as the mail server, the stub is , by convention,
called sendmail. /usr/sbin/sendmail sends via postfix.)
I'd credit this to badly setup third party mailers
As previously noted by others, yup. There might be a reason to use
the A record if there are no MX records but it's not correct. And if
there are MX records, it should never resort to using the A record.
Shame!
My advice is to not listen on port 25. You're just asking for trouble.
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