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Recently took over a seemingly undocumented Sendmail 8.13.1 server, running on CentOS 4.7.
Basically need to figure out what they are trying to accomplish via the config files. One thing that I find odd is that many domains appear in both the relay-domains file as well as the local-host-names file. What might be the reason for such a configuration?
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It may make some sense without FEATURE(relay_hosts_only).
local-host-names file ($=w) does not automatically catch subdomains of the listed names.
relay-domains file ($=R) **without FEATURE(relay_hosts_only)**automatically catches also sub-domains.
Exact domains with names listed in both files will be treated as listed in local-host-names but their sub-domains will be treated as listed in relay-domains.
AnFi
Posted 2013-05-21T20:39:19.160
Reputation: 771
It appears that FEATURE(relay_hosts_only) is not being used. It's not listed in the sendmail.mc and sendmail.cf contains "$* $=R" entries as opposed to "$=R" entries. But I don't get what you're saying - what would be the effect of the same entry in both files (outside of confusion)? It seems that it may make a difference with FEATURE(relay_hosts_only) as then the subdomains might get locally delivered instead of relayed but I'm not even sure that would happen. – None – 2013-05-22T01:12:45.943
IF example.net is present in both files THEN* example.net is treated as listed in local-host-names (it is a local email domain) AND host51.example.net is treated as listed in relay-domains ( sendmail will relay from and to it) FI. – AnFi – 2013-05-22T06:44:25.007