how to fix email receiving problem in redhat?
 

Folks,

Currently my mail server sitting on top of Redhat 9.0, sending email out is just fine, but
I could not receive any email from outside, one gentleman points me on how to fix
the problem, but did not let me know the detailed procedure?

So how to open my SMTP port (25)?

and how to make my server be in my DNS as an MX record? Right now my
ISP already bind my real IP addr with my domain name

Also do I need to add mail.my_domain.com to /etc/hosts file that already includes
www.my_domain.com and my_domain.com


Thx a ton,
HTM

>If you cannot receive mail to your colocated server, there are two potential problems

>1.) You need port 25/TCP open to allow incoming connections that deliver mail
>2.) Your server needs to be in your DNS as an MX record. That is how you tell other domains where to deliver mail to you. If you post the actual name of your domain, and the DNS name or IP of your colocated server, it will be much easier to tell you how to fix it.

netstat -tap will tell you all the listening sockets in operation.

I know this doesnt fix your situation but it will help.

Thx, I got it work, now I can telnet my_real_ip 143 port remotely (from my
LAN's server to my remote server)

I have 1 more question1 if you could help me:

I am using Mozilla 1.6 under Redhat 9.0 as my mail client,
after setting IMAP server as my domain name (corresponds to
my real IP), and set up everything else as usual, when I open
the inbox, the system says "login to mail server failed" - but obviously
my remote telnet works, why?