Fedora core 1 sendmail problems

[Ron Herardian]

Homer,

Double check that "Addr=127.0.0.1" is removed from the sendmail.cf file. The sendmail.cf file is only rebuilt on restart (or if you run make in /etc/mail) of sendmail if and only if you have the sendmail-cf package installed. This is the most common problem on Red Hat.

FYI, here's one way to do a basic sendmail setup (there are others), assuming that the sendmail-cf package is installed:

1. Go back and uncomment "# DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl"
2. Modify the line to read "# DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl"
   Note: We are deleting "Addr=127.0.0.1"
3. If this is a relay edit /etc/mail/relay-domains and add your domain (unless this is the server where all mailboxes reside)
   Note: /etc/mail/access does not need to contain anything if you're using /etc/mail/relay-domains because relay-domains says that no mail is relayed except mail destined for the domains listed (regardless of who's sending it), i.e., you accept mail for your domain and not mail to be relayed to other domains
4. Restart sendmail.

That's about all you need to do to get sendmail working for your domain and not as an open relay. Of course this assumes your IP address, router, netmask, host name, and domain name servers are all set up correctly.

Ron




Homer Sapions wrote:
> 
> I have been searching the archives of this list and google and not yet found
> the solution to my problem. It seems like this is a common problem with
> sendmail on new installations of Fedora, so I am frustrated by not finding a
> solution that works for me. I would really appreciate any help.
> 
> I had a RedHat 7.3 installation working properly, both sending and receiving
> mail with sendmail. I wanted a clean Fedora install, and since then I can
> send, but not receive mail.
> 
> I have modified /etc/mail/sendmail.mc and commented out the line
> dnl # DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
> then ran make -C /etc/mail and restarted sendmail with service sendmail
> restart.
> 
> I also modified /etc/mail/access and added
> localhost.localdomain           RELAY
> localhost                       RELAY
> 127.0.0.1                       RELAY
> myserver.mydomain.org   RELAY
> then restarted sendmail.
> 
> I have a 4 port linksys as a router/firewall between my cable modem and my
> server (and 2 other PCs). Port forwarding is enabled on the linksys to allow
> http traffic, and smtp on port 25 to be forwarded to the server - which was
> all working correctly before the Fedora install.
> 
> I ran ethereal and watched connections, not that I understand much of the
> packet info. I see connection attempts, but external mail servers never
> complete a connection. The typical pattern seems to be a remote server sends
> a SYN on port 25, I reply with SYN,ACK. Remote sends a SYN, I send 2
> SYN,ACKs. Remote sends a SYN, and I send 3 SYN,ACKs, and eventualy the rmote
> gives up.
> 
> >From any PC inside my network I can telnet to the server on port 25 and
> issue basic smtp instructions. I can do the same locally with 127.0.0.1
> e.g.
> # telnet myserver.mydomain.org 25
> Trying 192.168.1.12...
> Connected to myserver.mydomain.org.
> Escape character is '^]'.
> 220 myserver.mydomain.org ESMTP Sendmail 8.12.10/8.12.10; Sun, 28 Mar 2004
> 11:41:01 -0500
> mail from: someone at xxx.org
> 250 2.1.0 someone at xxx.org... Sender ok
> rcpt to: homer
> 250 2.1.5 homer... Recipient ok
> data
> 354 Enter mail, end with "." on a line by itself
> Subject: test message
> this is a test
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