E-mail Problem: Fedora, Postfix, Dovecot, Telnet 25
First: I'm really still fairly new to Linux, especially in the area of e-mail servers.
I'm running a Fedora box that I have configured as an e-mail server. I would like users to be able to both send and receive messages via this box using Postfix and Dovecot.
When I try to telnet to the box internally (from 192.168.0.100 TO 192.168.0.3) on port 25 it gives me the error:
Connecting to 192.168.0.3... Could not open connection to the host, on port 25: Connection failed.
I AM able to telnet to other ports (110, 80, 81, etc.).
When I issue the nmap command on my linux box it responds with:
PORT STATE SERVICE
21/TCP open ftp
22/tcp open ftp
25/tcp open smtp
53/tcp open domain
80/tcp open http
81/tcp open hosts2-ns
110/tcp open pop3
143/tcp open imap
443/tcp open https
993/tcp open imaps
995/tcp open pop3s
3306/tcp open mysql
It *looks* like port 25 is open in the firewall... so I'm not sure why a telnet connection is being refused. Using real trials, I've discovered I am able to log into the box via POP using Outlook (or any other client) but the box is unable to receive e-mails.
I'm assuming something is wrong with the Postfix configuration but I can't for the life of me figure out what... any help you can provide would be greatly appreciated.