Anyone know why my port 25 and 110 on linux redhat 9.0 is not open?

I check my iptables in /etc/sysconfig/iptables and see that port 25 is using ACCEPT option which meant it's open.

I did check nmap localhost and see that port 25 is open.

But somehow when i do nmap mydomain.org/com/net then the port 25 is not open but in state closed.

I need port 25 for my sendmail to work with my squirrelmail. So I be able to send mail and receive mail to outside source.

I did configure my sendmail such as.. go into /etc/mail/sendmail.mc and comment out the following line:

DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl

That is, place a dnl in front so it looks like the following:

dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl

Then I remake sendmail.cf file by moving into the /etc/mail directory and typing in make -C /etc/mail

Then I restart sendmail. (/etc/init.d/sendmail/restart)

Errr... the problem still not solve. I think that my deamon somehow is not listening to port 25. What do you guy think?

But if i do nmap localhost i see port 25 open.. that's doesn't make sense to my idea of daemon is not listening to port 25.

I'm right now very confuse.. any help? Please do.. i really appreciate it.

BTW.. I'm not an expert in linux or anything.. just a wanna be .. so please explain to me in a very gentle way ... or else I'll be even more confuse.

Thanks guy.. hope you guy read this statement and come up a solution that will work for me.

what you have might be a name resolution problem. Does the machine have any other IP ?

what IP does yourdomain.org/com/net point to ?

well my server also have apache running.. and host 3 virtual domain name. The domain name point to the private ip that point to specific server that I have.. the router do all the work...

btw the router also open for port 25 and 110..

I'm still not clear what you meant a name resolution problem.

Because squirrelmail able to let user log into login page, and access login folder such as inbox etc.. just that they can't send email or receive email etc...

what I meant is this:

if yourdomain.org/net/com is pointing to 10.1.1.10 (which is an IP on your machine), then your sendmail and your firewall both need to open/listen on 10.1.1.10 in addition to 127.0.0.1

what I understood from you is that connections are fine with 127.0.0.1 (localhost) as nmap and others are showing, but not for 10.1.1.10 (yourdomain.org/net/com).

is this your case ?

I know my firewall is open/listen on ex: 10.1.1.10

But how do you configure sendmail to do the same thing?

not really sure, but you can try this:

DAEMON_OPTIONS(`Port=smtp,Addr=10.1.1.10, Name=MTA')dnl

wow, finally, hehe, I'm so happy

Thanks jalal.. you a great help

oh.. oops.. i can only receive it, but not being able to send it out weird...

Just a thought - many ISPs are now blocking outgoing 25.