poige> Yes, I saw this info here:
poige> http://www.sendmail.org/m4/features.html#relay_mail_from but most
poige> valuable part of my question was about the purpose or the idea behind
poige> this, cause it's not too clear to me why allowing relaying for domain
poige> FOO.BAR should allow relaying for SUB.FOO.BAR?
Because some places have only one machine (firewall) that accepts mail from
the outside world for all of the hosts inside the network. For example, in
my previous life as a sysadmin at WPI, only smtp.wpi.edu would accept
incoming mail for all of the machines (> 3000) on campus. I'd much rather
say "wpi.edu" in one place instead of listing loads of subdomains
(ee.wpi.edu, me.wpi.edu, res.wpi.edu, ...).
poige> I mentioned RFCs because I had a hope to find out the answer from it
poige> but still haven't yet...
RFC's cover protocols over the Internet, not local configuration or policy.
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