edu (Bryan Curnutt) writes:
# I currently have A records for both "gateway.mydomain.com." and
# "mydomain.com." that point to the same IP address. This allows
# me to "telnet mydomain.com" or "ftp mydomain.com" from the Internet,
# and to send mail to "username @
com" if I don't set up an
# MX record, as long as sendmail on the remote machine from which I'm
# sending doesn't require an MX record to exist.
# If I set up an MX record for "mydomain.com." that points to
# "gateway.mydomain.com." then sendmail on the gateway machine won't
# work because it refuses to talk to itself. If I set up an MX
# record for "mydomain.com." that points to "mailhost.mydomain.com."
# then I can't receive mail from the Internet, because sendmail
# (or whatever) on the Internet machines attempts to contact
# "mailhost.mydomain.com." which isn't reachable from the Internet.
If you've already got an A record that points to "mydomain.com", then
you don't need an MX record that points there, too.
Brent Chapman Great Circle Associates
COM 1057 West Dana Street
+1 415 962 0841 Mountain View, CA 94041