Fedora core 1 sendmail problems

[Homer Sapions]

Current status - still not working. I did not manage to work on it much last 
night but I intend to try again tonight. Fortunately this is a personal 
web/mail server so inbound mail is for myself and a few other family members 
only.

Port 25 is not being blocked at the ISP or at the linksys. I can send mail 
out with no problems, but can not receive mail. Traffc _is_ definitely 
getting to the server on port 25. When I turn on tcpdump or ethereal 
watching port 25 I see inbound connections, and I see my server attempting 
to respond. Alexander Dalloz spent a lot of time attempting to help me debug 
this, doing as I had done previously from another ISP, telnetting to my 
server on port 25. He did not get an immediate disconnect, but it took a 
number of seconds. During this time, I could see via tcpdump him connecting 
to me, and my server attempting to respond, but he never got the ACK back 
from my server.

iptables is not running on the server, and sendmail is not behind 
tcp-wrappers. I am not aware of any routing problems, because outbound mail 
works fine, and all of my web pages are working fine, including 
Squirrelmail, CGI scripts etc. I have nothing in /etc/hosts.allow or 
/etc/hosts.deny, and I modified my sendmail.mc to comment out the DaemonPort 
options listing only the loopback IP address, then built a new sendmail.cf 
with make -C /etc/mail, and restarted the sendmail daemons.

Last night I uninstalled iptables and tcp-wrappers to be totally sure there 
is no correlation, but did not get as far as rebooting and testing some 
more. I had other problems with my cable modem connection and loss of all 
internet access for a while. I will try rebooting and testing further as 
soon as I get home tonight. I will take a look at your how-to doc also and 
see if I can pick up any possible problems from that.

>From: "Rodolfo J. Paiz" <rpaiz at simpaticus.com>
>Reply-To: For users of Fedora Core releases <fedora-list at redhat.com>
>To: For users of Fedora Core releases <fedora-list at redhat.com>
>Subject: Re: Fedora core 1 sendmail problems
>Date: Tue, 30 Mar 2004 08:58:46 -0600
>
>At 13:26 3/29/2004, you wrote:
>>I'm running a server - not a client. On the server I need to be able to 
>>both send and receive mail using SMTP on port 25 to/from other servers. 
>>I'm not catering for POP mail on port 110.
>
>Homer,
>
>I've lost track of what's going on here. What is your current status and 
>problem? Are you sure it's not a network issue (firewall, router, ISP 
>blocking the port, etc.)? Try also taking a look at the "Sendmail SMTP AUTH 
>HOWTO" on my website [1]. While the concept is not exactly what you want, 
>the steps shown for enabling receive from the network should work for you.
>
>[1] http://www.simpaticus.com/linux
>
>Only note that the sendmail.mc included there shows this line:
>    * define(`confAUTH_OPTIONS', `A')dnl
>In reality, the Fedora installation of Sendmail has `A p' instead. Remember 
>to remove the "p" or else it won't work; this is an error which I have 
>regrettably not fixed yet in the document.
>
>Cheers,
>
>
>--
>Rodolfo J. Paiz
>rpaiz at simpaticus.com
>http://www.simpaticus.com
>
>
>--
>fedora-list mailing list
>fedora-list at redhat.com
>To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list

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