send email from internel POP server to ISP

I need assistance with this scenario. I'm sure it's been asked a
hundred times
but I've been unable to find answers that work for my situation. I
want to
send an email from a Linux PC ((E-Mail Removed)) to my ISP account
((E-Mail Removed)).

My Linux server has the following services up and running: DNS, POP3,
Sendmail,
FTP, Telnet, and Apache. I have a Linksys router and I put my Linux
server in
the DMZ so I can reach all the services.

The DNS server is configured as a Caching NameServer as per
instructions I found at
http://www.linuxhomenetworking.com/l...dns-static.htm

>From my Windows XP machine I pointed the Primary DNS server IP adress
to my Linux server (192.168.0.201). I then opened OE and configured it
to send and receive email from inside my LAN. Simple test was to send
a message to myself
(To: (E-Mail Removed)). I received the message without errors. So
the POP3
configuration looks good.

However, when I send a test message (To: (E-Mail Removed)) I receive an
error
immediately saying that OE can't send. Something about the "relay
denied".

That's pretty much it.

On 2005-09-25, d <(E-Mail Removed)> wrote:
> immediately saying that OE can't send. Something about the "relay
> denied".

Read the documentation of Sendmail about selective relay.
Davide

--
Ignorance is bliss, and when it comes to computing, I want everyone to
be happy... --Ryan Tucker

Davide Bianchi wrote:
> On 2005-09-25, d <(E-Mail Removed)> wrote:
> > immediately saying that OE can't send. Something about the "relay
> > denied".
>
> Read the documentation of Sendmail about selective relay.
> Davide
>
> --
> Ignorance is bliss, and when it comes to computing, I want everyone to
> be happy... --Ryan Tucker

I'm still stumped. I updated my access list to include the IP address
of the client machine I'm trying to send from. That got me from the
"relay denied" error to another.
***
The original message was received at Sun, 25 Sep 2005 09:27:13 -0400
from lan3 [192.168.0.111]

----- The following addresses had permanent fatal errors -----
<(E-Mail Removed)>
(reason: 550-xx.xx.xxx.xx blocked by
blacklist.mail.ops.asp.att.net.)

----- Transcript of session follows -----
.... while talking to gateway-s.my-isp.net.:
>>> MAIL From:<(E-Mail Removed)> SIZE=2015
<<< 550-xx.xx.xxx.xx blocked by blacklist.mail.ops.asp.att.net.
<<< 550 my-isp.net subscribers are no longer permitted to directly
connect to this mail server. To send email to other my-isp.net
subscribers, you may forward messages through smtp.my-isp.net
554 5.0.0 Service unavailable

On 2005-09-25, d <(E-Mail Removed)> wrote:
><<< 550 my-isp.net subscribers are no longer permitted to directly
> connect to this mail server. To send email to other my-isp.net
> subscribers, you may forward messages through smtp.my-isp.net
> 554 5.0.0 Service unavailable

meaning: if you want to send a mail, you need to use the smtp server
provided by your ISP, otherwise the mail is refused. This is another
anti-spam measure that some ISP uses to cut down (or try to) on SPAM
sent by zombie-pc and possessed machines.

Davide

--
D: is just a data disk. That's why it's called "D", for "DATA".
C: is the Windows OS disk, so it's called "C", for "CRAP".
-- David P. Murphy

>
> meaning: if you want to send a mail, you need to use the smtp server
> provided by your ISP, otherwise the mail is refused. This is another
> anti-spam measure that some ISP uses to cut down (or try to) on SPAM
> sent by zombie-pc and possessed machines.
>
> Davide
>
> --
> D: is just a data disk. That's why it's called "D", for "DATA".
> C: is the Windows OS disk, so it's called "C", for "CRAP".
> -- David P. Murphy


Work through more issue and now I'm getting the following. I guess I
need to have my domain registered to get past this error. If I don't
need to register the domain name. What can I do to make this work?

The original message was received at Sun, 25 Sep 2005 16:16:53 -0400
from lan3 [192.168.0.111]

----- The following addresses had permanent fatal errors -----
<remote-(E-Mail Removed)>
(reason: 553 5.1.8 <remote-(E-Mail Removed)>... Domain of sender
address local-(E-Mail Removed) does not exist)

----- Transcript of session follows -----
.... while talking to mx4.isp.com.:
>>> DATA
<<< 553 5.1.8 <remote-(E-Mail Removed)>... Domain of sender address
local-(E-Mail Removed) does not exist
550 5.1.1 <remote-(E-Mail Removed)>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)