Sendmail, Postfix, and RH Linux 9

[Magueta]

Hi all.

I'm trying to get my mail server to work and I have the domain and I've edited the file in /etc/postfix called main.cf. I've read the basic configuration how-tos at postfix.org and I've setup port forwarding on my router for ports 25 and 110 to my mail server. I also have an iptables firewall on my mail server on which I've opened ports 25 and 110 both udp and tcp. I'm able to send mail from my mail server but I am unable to receive. I'm unsure what the problem is but I suspect that it may be that I have both Sendmail and Postfix installed on the same system but, because they have been both installed from the initial installation I'm reluctant to uninstall Sendmail and risk breaking my mail system (I have logs sent to my e-mail daily for my webserver, tripwire, ssh, etc.)
Anyone know what I should do?
Thanks

Joe

[Radar]

You may have both packages installed, but only one actually running, which is ok. Here is how you can find out what you have and what's running.

[wayne@futur11 wayne]$ ps -ef | grep sendmail
root     22668     1  0  2003 ?        00:00:00 sendmail: accepting connections
wayne    27118 27063  0 12:14 pts/1    00:00:00 grep sendmail
[wayne@futur11 wayne]$ ps -ef | grep postfix
wayne    27121 27063  0 12:14 pts/1    00:00:00 grep postfix
[wayne@futur11 wayne]$ rpm -qa | grep postfix
[wayne@futur11 wayne]$ rpm -qa | grep sendmail
sendmail-cf-8.11.6-28.72
sendmail-doc-8.11.6-28.72
sendmail-8.11.6-28.72
sendmail-devel-8.11.6-28.72
[wayne@futur11 wayne]$

And I also think that redhat uses a "mail switching" tool.