Can send but no receive mail
 

I have Linux mail server, It always encounter this problem, when i shut down or restart the server. You cannot receive mail but you can send..
i use the following services:
iptables -F
service iptables restart
service sendmail restart
service dovecot restart
before when i run this services the email can send and receive..
hope you can help me..
thanks

sorry ,I am a new one,I can't answer you question,but i hope you resolve your question soon,good luck!

What order are you running the above commands?
flushes out firewall rules, but then if you restart iptables, the rules are applied again. So you may skip

Sounds like iptables is blocking ports, can you post the output from this command so we can see what rules are in place

I use this rule to receive.

-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 25 --state NEW -j ACCEPT

i use the nmap application to check all ports.
pop3 110 port was not open.
how can i start the pop3 ports..

sir here is the output for
as you see there in no port 110. i think that is the problem why there is no receive mail.. how can i configured the pop3 port

OK you are restarting iptables but you do not have a rule to open the POP3 port, try adding this rule and see if it helps

now i can receive mail..
when i use the iptables -F and with out restart the iptables services.
just like what you said.
but i think there is no rule for may port 110, because when restarting the server same problem occurs.i must try this..

To really flush the rules you also need to delete any user created chains, try this to get a full flush of any rules.