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Hi, I just set up a Fedora Core 3 system which will server web pages and also act as my SMTP server. Everything is working beautifully except sendmail....
The problem I have is that sendmail only works if I'm sending the mail from within my own LAN on the 192.168.* subnet. If I try to send an email using my SMTP server from outside the LAN I get an error stating that it couldn't be accessed on port 25!
Now this is what's got me really stumped:
1] The firewall, router, etc. is definitely set up properly and port 25 is open to the outside world.
2] Doing the reports on dnsreport.com indicate the MX record, etc. is set up correctly and that mail can be sent ot the postmaster@ and abuse@ addresses.
3] In my sendmail.cf file, I have manually commented out the "DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl" bit - even though, as you can see, I took off the loopback thingy anyway.
I've rebuilt the .cf , etc, etc. and rebooted several times but still no luck. This is really driving me insane. I know it's got to be something really simple and easy but I can't see the wood for the trees.