IMAP & SMTP running on a server
Finally I set up IMAP and SMTP services on my REdhat 9.0 server,
I am confused with the following phenomena:
1. IMAP is running fine, I can both telnet at 143 port on the server, and doing an nmap, 143 is also open; but I could not telnet at 143 port from outside, why?
2. I use sendmail, sendmail is running, but doing an namp, I don't see 25 port
is open; also even on the server, I tel net 25 port, connection refused, I am sure
I opened SMTP port when I customize my firewall