Creating mail-enabled groups in Exchange 2003

Assuming that it is not acceptable to have in the from field;
User@acme.com on behalf of manufacturing@acme.com

Then you only have a couple of options.  The main issue is that you can only have one exchange account per Outlook profile.  To work around this you only have two real options

1) You could setup the second email account using IMAP or POP3.
2) You create a second profile in Outlook.  In the more commonly used profile you can open the other users mailbox using the "Open these additional mailboxes" features then when you see and email come in you can close the one profile and switch to the other profile, and send the email.

This post goes over the "Open these additional mailboxes"
https://www.experts-exchange.com/questions/21869847/Outlook-Open-these-additional-mailboxes-feature.html

I've also gone over this in detail in this other post.
https://www.experts-exchange.com/questions/23843503/Setup-Exchange-2007-for-multiple-internet-domains.html

good luck,
tenaj

I was afraid of that.  So do you have a doc avail on setting up SMTP?  I have control of over my registrar (external DNS control), as well as router control... (inbound\outbound pop\smtp).   I'm concerned about security with SMTP, and misconfiguring something with the end result being that spammers can use my exchange box as a relay?

the second account method wont work - as you want to send from the groups email address.

do you need to have the group?
can you have ..
a user - manufacturing
with a rule to forward a copy to all the group members
and then use a second smtp account on each user to be able to send FROM the manufacturing user.

smtp will be safe internally if you have good antivirus and you must have for external anyway.

so once you have the manufacturing user
you need to set up a second account - the second account should be pop/smtp with the internal ip address and AD username and password - and the alias email address you want to use.
Then you can configure outlook not to receive mail for this account (in define send/receive groups)
then when you create an email you will have a new button on the toolbar for account.
You will also be able to define a second signature that will change automatically.

in exchange..
default smtp server, access, relay, users - allow authenticated users to submit and relay

this will ensure you arent open relay

but imap and pop3 both need a SMTP server to send - and it is sending that is the issue?
imap has the advantage of leaving the mail in the manufacturing mailbox - but you still need to send as

you could use the exchange send as permissions to give the user sending permissions to choose manufacturing in the from field - but then you have the on behalf of issue.

@wolfcamel - If the exchange server is already setup and working then it's using SMTP to send emails.  When you setup IMAP it uses the same exchange SMTP server.  There is no need to reconfigure it or create a new one to use IMAP.

@sna1alm - if you want to make sure that you aren't an open relay you can follow wolfcamels directions or you can go to http://mxtoolbox.com and type in your domain name, click on MX Lookup, then click on Diagnostics, then click on test email server.  This will let you know if you server is an open relay.

-tenaj

Alright guys so this is what I did...

1)  Had my user that needs both accounts to start using terminal services (hes at a remote site).  So now hes accessing the network locally.
2)  I deleted the universal group account, and created a new user manufacturing.  
3)  I added relay rights the manufacturing account in ESM in the SMTP virtual server.
4)  I created DNS A records on the DC for pop3.acme.com and plugged the internal ip of the exchange server under "SMTP Server", and added the manufacturing user credentials.
5)  So it works and he can send and receive email from the manufacturing account, but its whacked.  When ever he sends from the newly created pop\smtp account (while simultaneously accessing his user exchange account)  Outlook pops up with the new recieved mail "fade in\fade out" alert down near the system tray.

So I think I got it work, but I back-doored it.  My DNS is working but not correctly, I had to add the exchange IP and not use the new DNS A record "smtp.acme.com" record (which pointed to the exchange IP) because when I attempted to send using this record, I got instant bounce backs.

Should I be using cnames instead of A records?  

Also what about using the internet email wizard in ESM?

Feedback is much appreacited!

Thanks guys.  I appreciate everyone taking the time to help me out.  Take care.