postfix connection timed out issue on centOS

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Operating Systems Linux Red Hat postfix connection timed out issue on centOS
# 1  
Old 10-31-2009
postfix connection timed out issue on centOS

hello everyone

i hav LITTLE issue, pending for just last week regarding postfix/sendmail server.
M not able to forward mail to outer domain.
I hav not configured DNS server uptill now, so nvr tried to receive mail from any domain, as i don require that as of now.
Can anybody suggest a lifeline for that, coz i don want to b a millionaire, just want to resolve this issue.

error: connect to[]: Connection timed out

Mentionable: OS:- centOS 5.3
Postfix able to sendmail in inner domain
SELinux is disabled.
Port used to communicate is 25
Please tell the pattern if , if any, in detail, as i am new to linux.

# 2  
Old 10-31-2009
I am confused. Are you trying to use both Postfix and sendmail? You can use only one or the other but not both at the same time.
# 3  
Old 11-02-2009
hello Murphy

Well the thing is, i hav tried installing both of them, not simultaneously, but failed with both to send mail to outer domain and having almost same issue...

Previously , i was trying with sendmail, then somewhre i read that sendmail is not a gud option for centOS, so i switched to postfix,and not able to get the required output with postfix as well and the error: connection timed out..

# 4  
Old 11-04-2009
I am not getting any response too, by telnet the ip address of the receiver domain.

Whats cud be the issue...
# 5  
Old 11-04-2009
Postfix, by default, will forward mail to authorized remote destinations only. Authorized remote destinations are defined with the relay_domains configuration parameter. The default is to authorize all domains (and subdomains) of the domains listed with the mydestination parameter.

        relay_domains = $mydestination

What is your $mydestination set to?

Postfix, by default, attempts to deliver mail directly to the Internet. However your system may be behind a firewall, or it may be connected via a provider who does not allow direct mail to the Internet. In those cases you need to configure Postfix to deliver mail indirectly via a relay host. You should specify one (and only one) of the following:

        relayhost =                               (default: direct delivery to Internet)
        relayhost = $mydomain            (deliver via local mailhub)
        relayhost = [mail.$mydomain]   (deliver via local mailhub)
        relayhost = [mail.isp.tld]           (deliver via provider mailhub)

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