topic Re: sendmail problem in Operating System - Linux

sendmail problem

haeman — Wed, 29 Oct 2008 08:43:01 GMT

I have newly setup a server , and started the sendmail service , I have config the sendmail.cf as below and then restart it

"Smart" relay host (may be null)
DSmail-server

But now still can't sendmail mail out , I have other server that have the same setting can do , so I wonder is there other config file that I need to change to make it work ? please advise thx

Re: sendmail problem

Ivan Krastev — Wed, 29 Oct 2008 10:05:31 GMT

Check if you relay host is accessible:

telnet relay_host 25

regards,
ivan

Re: sendmail problem

Ivan Ferreira — Wed, 29 Oct 2008 12:08:23 GMT

Post the output of /var/log/maillog. Ensure that mail-server can be resolved.

Re: sendmail problem

Steven E. Protter — Wed, 29 Oct 2008 13:37:01 GMT

Shalom,

In sendmail.cf you should set a relay server

DShostnameofrelayserver

The relay server must be explicitly set up to relay your systems mail.

Most Corporate LAN environments won't let you send mail directly, the spam risk is too high.

SEP

Re: sendmail problem

Court Campbell — Wed, 29 Oct 2008 14:18:13 GMT

I would suggest installing the sendmail-cf rpm. Then edit the mc file and restart sendmail. This will run m4 for you, etc. This may not resolve your issue, but it is the red hat recommended way of modifying sendmail.

Re: sendmail problem

skt_skt — Wed, 29 Oct 2008 17:35:32 GMT

see if this helps

sendmail.cf file coming with some RH only listens on loopback interface. u can see that in netstat -an

it looks like this

tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN

I Commented following option and restarted the sendmail daemon.

O DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA

Then after restarting the daemon using netstat -an.
the output changed to

tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN

My mail now works