problem send email -centos5-postfix

[carlainz]

hello

i have installed on centos5 postfix with this howto http://www.howtoforge.com/perfect_setup_centos5.0_p5?

now i use squirelmail to test it , and i can receive email ,but i can't send .
my firewall and selinux are disable , the router is ok.

in my var/log/maillog i have this :

Apr 25 10:18:24 mydomain postfix/smtp[8255]: connect to mx6.libero.it[212.52.82.7]: Connection timed out (port 25)
Apr 25 10:18:24 mydomain postfix/smtp[8255]: 56B201B80ED: to=<xxxxxx@libero.it>, relay=none, delay=150, delays=0.03/0.02/150/0, dsn=4.4.1, status=deferred (connect to mx6.libero.it[212.52.82.7]: Connection timed out)
Apr 25 10:18:43 mydomain postfix/smtp[8303]: connect to iron.libero.it[212.52.84.52]: Connection timed out (port 25)


i have try to send email to different server , gmail,hotmail,yahoo,libero , but is always the same : Connection timed out .

any suggestion ?
thanks

[falko]

Please check if your server got blacklisted: http://www.mxtoolbox.com/blacklists.aspx

[carlainz]

hello , thanks but my server is not in blacklist .......

[falko]

Do you host your mail server at home or in an office, or is it in a data center?
If you host it yourself: Please ask your ISP if they block port 25.

[carlainz]

hello , my server is at home ,
my ISp block port 25 , i use smtp redirect to another port and work fine ( for receive),
for outgoing i have set in main.cd relayhost = smtp.wanadoo.nl (my isp)
but doesn't work .....

if i telnet smtp.wanadoo.nl 25 , i don't have answer .....

can i use another port ?

thanks

[falko]

if i telnet smtp.wanadoo.nl 25 , i don't have answer .....

can i use another port ?

You can use only the ports that the smtp.wanadoo.nl offers.
I've just tried to telnet that server from my own server (in a data center), and also can't connect.
Are you sure this is the correct server? If so, I'd contact the Wanadoo support and ask what's wrong.