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If you mean the company that gives me access to the Internet here at my office, no. Both my other servers have no problem with email.
This new server is with a company I've not used before. It's possible they're blocking port 25 (and I've asked just in case), but it would be extraordinary if they did given this is a dedicated server and needs to send and receive email.
NOTE: I can "telnet localhost 25" just fine.
It's "telnet 18.104.22.168 25" from another machine (own PC using secureCRT and telnet while logged in to my other web server) that cause the problem.
So it seems to me, the issue mus be around something preventing connections from port 25 from outside the server itself.
And I'm wondering if there's something obvious on the box itself that I've overlooked (e.g. I'm know nothing about iptables, so may have misunderstood what's I'm seeing there).
For example, the line...
REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
...appears at the bottom of the iptables report when I type "service iptables status" Is this the problem? Baring in mind the file also contains...
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25
Last edited by 60s TV Batman; 03-19-2007 at 09:54 AM.
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 12666/sendmail: acc
That line says that sendmail is only listening on 127.0.0.1. Only connections coming from 127.0.0.1 will be accepted. If send mail was listening for any incoming connection the line would say this:
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 12666/sendmail: acc
You definitely need to check out your configuration to see what is up.
To test this out further, you say you can telnet localhost 25 just fine, but replace localhost with the IP address of the network adapter.
I'm using FC6 and here is what I have in my sendmail.mc:
The top line was what was originally there (with out the dnl # and tailing dnl). I replaced it with the bottom line. I believe if you restart sendmail after that it will compile your sendmail.mc file to the sendmail.cf for you. Or you can do m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf with root privey. Back up your old cf file.
It may be my problem isn't a blocked port at all. As of right now, my /etc/resolv.conf file doesn't contain the IPs of my hosting companies nameservers. I suspect that is the main problem.
That wouldn't stop you from at least making an initial connection to port 25.
Last edited by benjithegreat98; 03-20-2007 at 11:05 AM.
if m4 is having trouble then the make -C /etc/mail command will fail because it depends on the presence of m4
You can look at /etc/mail/Makefile to see what the make command is doing.
The main problem was /etc/resolv.conf didn't contain the IP addresses of my server's hosting company's nameservers. As a result, Yum wouldn't work.
Yesterday, I managed to find out what the IP addresses are. As soon I entered them in resolv.conf, I was able to use Yum to install sendmail-cf. Then I was able to update sendmail.cf via sendmail.mc as per normal.