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Old 09-02-2002, 12:46 AM   #1
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Question sendmail problem on Red Hat 7.3

I have installed Red Hat 7.3 on my pc for the purpose of setting up a new email server. When the installation was done, I tried to telnet my local ip (eth0) at port 25 but the connection was refused.


telnet 25
telnet: connect to address connection refused

Without configuring anything, i tried telnet to the same linux machine using localhost.


telnet localhost 25
Escape character is '^]'
220 my.smtp.mailserver ESMTP Sendmail 8.11.6/8.11.6; ..........

How was I able to connect to my smtp port using localhost and address while I could not connect to the same port on the same machine using my local Lan Card's ip address....? Normally on my Red Hat 7.0, I was able to telnet on port 25 on any local IP within the same machine.

Please help me out trace the problem considering that Red Hat 7.3 is very new to me. Hope you could be of help.

Old 09-02-2002, 01:20 AM   #2
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because if you look at the sendmail configuration file (/etc/mail/ you will quite clearly see that sendmail defaults to only listening internally. it's all in the documentation.
Old 09-02-2002, 06:42 PM   #3
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Lightbulb need more idea

Hello, Thanks for the great advice. I also made some modifications on the on the DaemonPortOptions and declared both my internal and external IP address before I saw your post. Did I made the right thing? I had a backup of my old email server currently online to cater for our company email requirements running under linux 7.0. I had to shift to 7.3 for a more secure environment. I had imposed a trend viruswall on my old email server but got a lot of problem setting up the anti-relay features. I was thinking if you can provide further assistance on how I could control the anti-relay and what other options you might suggest for the email filtering ? I found trend viruswall useful but the anti-relay feature is complicated to setup. I would greatly appreciate if you can again extend some assistance to my inquiries.

Hope to hear from you again


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