I try to telnet from outside, but there's no response. From internal or my other servers that in one subnet, I get this answer telnet reynaldi.dyndns.org 25 Trying 202.152.21.230... Connected to reynaldi.dyndns.org. Escape character is '^]'. 220 arie.reynaldi.dyndns.org ESMTP Postfix But from other place I got no response telnet reynaldi.dyndns.org 25 Trying 202.152.21.230... telnet: connect to address 202.152.21.230: Connection timed out And in my /var/log/mail, there's no messages that shows any connection from ex. yahoo.com or any other servers. I think it's firewall problem :(
Test it from outside with a
$ telnet yourserver.dyndns.org 25
If you get an answer like:
220 yourserver.dyndns.org ESMTP Postix
it is not a firewall problem. Then you will have to configure postifx correctly.
Christian
-- Arie Reynaldi Zanahar reyman@reynaldi.com