I'm trying to get sendmail working on RH 7.1; unfortunately, port 25 is not open on my system. I can do "telnet localhost 25" and talk to sendmail, but telnetting to the real domain name (from my linux machine or from another host) fails with a "connection refused" message.

I found the issue with sendmail.mc's blocking external connections in RH 7.1, and have commented out the DAEMON_OPTIONS line and re-generated sendmail.cf. I've also added "sendmail:ALL" to /etc/hosts.allow. But port 25 stil isn't open, so none of this seems to matter. Any ideas as to what I'm missing?

Thanks,
Jim Miller

If you found the answer please tell me i have the same problem.

Thank you

Red Hat offers to configure a firewall for you when you install it. This can block port 25, did you enable the firewall?

By default in RH 7.x sendmail only listens on localhost. Do a search for the answer.

http://www.linuxquestions.org/questions/search.php

Hi..


By default the sendmail.cf file coming with RH7.1 only listen on loopback interface. u can see that in netstat -an

it will show like this

tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN


Comment the following option and restart the sendmail daemon.
it will work

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


Pls check after restarting the daemon using netstat -an.
the output will be like this

tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN



This feature may be useful if we have multihomed linux and if u want to listen in particular segment or only from that machine.



Siddiqu.T

Siddiqu --

Good advice; unfortunately, I've done this, and it's not working. I've commented out the DAEMON_OPTIONS line in my sendmail.mc file, and then generated a new sendmail.cf file. The sendmail.cf file contains the lines:

# SMTP daemon options
O DaemonPortOptions=Name=MTA

so it looks like the change worked. But after I restart sendmail, netstat reports that the 127.0.0.1 restriction is still in effect:

netstat -an | grep 25
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN

I've also tried rebooting in addition to manually restarting sendmail (just in case....), but that also gives the same result.

Any other suggestions? It looks like something else is involved....

Thanks,
Jim

Hi ,

Instead of 127.0.0.1 you need to put in your valid ip address and then sendmail listend on that .
If DNS is not configured on your machine than the chances are that sendmail will again start listning on 1227.0.0.1 .

I had similar problem and had to change the string and it all started working.

Regards ,
Vipul .