poige> I noticed that some mailers (sendmail, postfix) in case they allow
poige> relaying for somedomain.zone also allow relaying for
poige> subdomain-of.somedomain.zone.
poige> I can accept this as reasonable behavior but would like to know how to
poige> deny it! :) Also I wish to know what was the actual idea behind this?
From /usr/share/sendmail/cf/README:
+----------+
| FEATURES |
+----------+
...
Available features are:
...
relay_hosts_only
By default, names that are listed as RELAY in the access
db and class {R} are domain names, not host names.
For example, if you specify ``foo.com'', then mail to or
from foo.com, abc.foo.com, or a.very.deep.domain.foo.com
will all be accepted for relaying. This feature changes
the behaviour to lookup individual host names only.
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