Re: [cobalt-users] Sending e-mail behind firewall

["Doug Ferrell, KD4MOJ" <aprstlh@xxxxxxxxxxxxx>]

> You need to port foreword Port 25 to your internal mail server
> Also Port 80 for outside basic http access
> I already do that for 4 of my servers and several customers servers...
> Unless you need POP Access from outside the firewall Port 110 is not
needed

Howdy Franklin. Yep I'm receiving mail.... and http just fine and dandy. The
problem I am having.... is when sending mail: Here is the snippet again.

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eat-free.com', Protocol: SMTP, Server Response: '550 5.7.1
<doug@xxxxxxxxxxxxxxx>... Relaying denied. IP name lookup failed
[192.168.1.1]', Port: 25, Secure(SSL): No, Server Error: 550, Error Number:
0x800CCC79
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    It seems the receiving mailer is seeing the 192.168.1.1 gateway and
trying to resolve that to my domain name. It looks like my internal IP
addresses are being passed through the router and the receiving mailers are
rejecting it. At first I thought it was the router, Linksys BEFSR41, but I
just did a test on my other Linux box (the example below) and the mail is
sending just fine.  Below is my Linux machine on the 1.2 address. It is the
kd4moj.org sending to rsda.com

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doug@xxxxxxxxxxx Connecting to rsda.com. via esmtp...
220 rsda.com ESMTP Sendmail 8.11.2/8.11.2; Wed, 17 Dec 2003 16:14:38 -0500
>>> EHLO aprs.kd4moj.org
250-rsda.com Hello user70.net031.fl.sprint-hsd.net [207.30.5.70], pleased to
meet you
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-SIZE
250-DSN
250-ONEX
250-ETRN
250-XUSR
250 HELP
>>> MAIL From:<doug@xxxxxxxxxxxxxxx> SIZE=38

250 2.1.0 <doug@xxxxxxxxxxxxxxx>... Sender ok
>>> RCPT To:<doug@xxxxxxxx>
250 2.1.5 <doug@xxxxxxxx>... Recipient ok
>>> DATA
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 hBHLEcH10370 Message accepted for delivery
doug@xxxxxxxxxxx Sent (hBHLEcH10370 Message accepted for delivery)
Closing connection to rsda.com.
>>> QUIT
221 2.0.0 rsda.com closing connection
[doug@aprs doug]$
[doug@aprs doug]$

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