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I Have a server with Fedora Core 4, squid proxy, iptables, dovecot (was pop3), sendmail, openwebmail, etc. On my LAN all works great... but can't check external servers for mail. ...
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  1. #1
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    Can't check external mail through my server


    I Have a server with Fedora Core 4, squid proxy, iptables, dovecot (was pop3), sendmail, openwebmail, etc.

    On my LAN all works great... but can't check external servers for mail.

    On a client (windows) i do a ping to the server and i get response with good conection...
    100% packets ok.

    but if i do a telnet to the same external server.... my server respond the query.... not the server what i'm try to get data...

    telnet mail.external.net 110
    -> +OK Dovecot Ready....

    i'm missing something in the iptables??
    i do a echo 1>/proc/sys/net/ipv4/ip_forward

    there is a special chain to add to iptables to forward the trafic fomr port 25 and 110 if the address don't match my server?

    Thanks in advance!!

  2. #2
    Linux User yourname3232's Avatar
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    Aug 2005
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    Pacific Northwest, USA
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    Is your server behond a router? If so then you would have to forward ports to your linux box. If you don't then requests form the outside world will be dropped.

  3. #3
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    My server linux have 2 ethernet cards.... the request from outside can be served like webserver, sendmail, etc... (have static ip)

    but if i am a client of my server (LAN)... i can't check another mail, only my internal mail with the outlook...

    (client) <----> (serverinternal) <-----> (another server)
    packed to another..------>>|

    if i configure a second acount on the outlook (an external one).. only ,my sendmail respond... cant reach the external mail server...

    like i wrote before...
    telnet server.external.net 110
    > internat.server.net ok... (responding and not the external one.)

    ping to the external server is ok. 100% packed ok

    how can i forward that packed if both servers use ports 25 and 110? my server (internal) and another external server (any server...)???

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