Cannot Send Emails.... SMTP Settings?

[Noncentz]

Morning All,

I volunteer with a non-profit organization and I recently have moved them
over to a Windows 2003 AD setup... your basic stuff. The computer lab that
the non profit works out of is just one segment in a larger network
controlled by the building Admin.

Currently I have file sharing and all my services on this computer Lab's LAN
but the teachers are on another which is technically the rest of the building
LAN. The problem I am having is with the POP/SMTP settings. The non-profit
uses a 3rd party mail service to recieve email and the building outgoing mail
server to send email.

These are the settings:

Incoming Mail Server POP3: mail.ceocolorado.org
Outging Mail Server SMTP: mail.int-iccs.org

Currently the Teachers have to access file sharing on the Lab's LAN and
access shared applications on the building LAN so I setup 2 network cards on
their PC's so then could use both networks interchangably. When I am
connected to the buildings LAN (ICCS) I can send and recieve email just fine
but when I route traffic through the Lab (CEO) I am able to recieve email but
I cannot send them.

I get this error back:

From: System Administrator
Sent: Friday, January 09, 2009 9:55 AM
To: Sender
Subject: Undeliverable: test

Your message did not reach some or all of the intended recipients.

Subject: test
Sent: 1/9/2009 9:55 AM

The following recipient(s) could not be reached:

'(e-mail address removed)' on 1/9/2009 9:55 AM
553 sorry, that domain isn't in my list of allowed rcpthosts
(#5.5.3 - chkuser)
-----------------------------------------------
I did create a seperate domain for the Lab (CEO) for administrative purposes
but when I send from this domain onto the buildings LAN everything is fine.
Any thoughts as to what might be causeing this error.

Any help will be greatly appreciate and sorry this was so long-winded.....

Noncentz

 

[Brian Tillman [MVP - Outlook]]

These are the settings:

Incoming Mail Server POP3: mail.ceocolorado.org
Outging Mail Server SMTP: mail.int-iccs.org ....snip...
I get this error back:

From: System Administrator
Sent: Friday, January 09, 2009 9:55 AM
To: Sender
Subject: Undeliverable: test

Your message did not reach some or all of the intended recipients.

Subject: test
Sent: 1/9/2009 9:55 AM

The following recipient(s) could not be reached:

'(e-mail address removed)' on 1/9/2009 9:55 AM
553 sorry, that domain isn't in my list of allowed rcpthosts
(#5.5.3 - chkuser)

This error indicates you're not authenticating to the outgoing server. When
you have differing domains for the POP and SMTP servers, typically you need
different credentials for each server. The main screen of the account
properties will have a place for username/password credentials. These will
be the ones used for the POP server. Click More Settings and there will be
an Outgoing Server tab. On that tab, the "My outgoing server requires
authentication" box should be checked and the radio button that allows you
to specify another username/password pair should be chosen. The username
and password will be for the SMTP server.