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I'll start with saying: I'm not sure what exactly I need. I googled for "sendmail LAN" and variants, and it seems I need a "null client" setup. So that is my assumption, not my requirement (hence the not so clear title)
Shortly: I have 1 centos (v6) server running XMail server (latest), which hosts email for a few domains, incoming and outgoing. I have a PC in the LAN that is able to SMTP and POP for the accounts hosted on it. The server itself is able to send email both local (like from cron jobs) and domain users.
Let's call this "server".
Now I have a need to configure an existing CentOS server (v5) to send its local (cronjob) emails (scripts are using sendmail) and also php scripts to be able to send out emails (but those usually configure the smtp user/pass, so that should be good; I haven't gotten that far yet)
Let's call this "client".
On "client" I configured a null client sendmail thing based on this: http://www.faqs.org/docs/securing/chap22sec177.html
There are only those 4 lines in the null.mc, with the domain changed to mine (let's use example.com)
OSTYPE('linux')dnl
DOMAIN('generic')dnl
FEATURE('nullclient','example.com')dnl
undefine('ALIAS_FILE')dnl
There is a line in /etc/hosts mapping example.com to the LAN IP of "server". (Ping responds properly). Also, telnet on port 25 is connecting and responding properly.
I then issued
#sendmail -v root@example.com < /tmp/email.txt
where the result is
root@example.com... Connecting to [127.0.0.1] via relay...
root@example.com... Deferred: Connection refused by [127.0.0.1]
May be a dumb question, but why is it trying to connect to localhost instead of example.com on the LAN? Is it not a null client configuration that I need? Or am I missing some stuff not covered by the tutorials?
Thank you.
I really recommend using a more modern mailing program on the "client". Configuring sendmail can be a PITA. – dirkt – 2017-04-06T09:54:35.073
if by "modern" you mean a GUI app, then that's out of the question since the "client" is actually a server box, so no desktop on it. If you mean something else, please provide an example so I can try it out. – ciuly – 2017-04-09T16:37:42.443
I actually don't know any sendmail replacement with GUI, and I doubt such a thing exists. More modern mailers are for example
exim
,qmail
, orpostfix
. E.g. on Debian,exim
is the default. – dirkt – 2017-04-09T17:15:51.320