Choosing your SMTP address

A common scenario for Exchange administrators is the need for a user to be able to reply from multiple SMTP addresses.

Exchange 2000 allows a user to have multiple SMTP addresses, but only one can be used as the primary SMTP address that is seen on all outgoing messages.

Solutions to this problem include:

1. Create another mailbox per additional SMTP address required, and assign the relevant access rights to those mailboxes. Assign the correct primary SMTP address to each mailbox, and inform the users how to use the 'From' field in Outlook to select the sending mailbox.

2. Use Outlook Express, which can be configured with custom SMTP addresses.

3. Check out Victor Ivanidze's ChooseFrom event sink, which will do this for you.

Neil Hobson

Chris Meirick on July 25, 2003 at 01:55 AM in How-Tos
« Dealing with Badmail | Main | OWA and multiple SMTP domains »


Hi, I would like to change the site name on my Exchange 5.5

Is there a way to do this without reinstalling the OS or
Exchange 5.5?


Posted by: Tim Englert at Mar 22, 2004 6:54:18 PM

Hi Tim,

You can safely change the Site's 'Display Name'... do this via the 'Properties' of the 'Site.' Once you've done this, the new name will be displayed throughout. Does this sound sufficient?

Just make sure that you document the change too.

Posted by: Chris Meirick at Mar 23, 2004 12:41:48 AM

non so

Posted by: ultra at May 30, 2004 9:34:59 AM

anyone found a way to do this in exchange 2003 that doesn't involve using a 3rd party solution?

Posted by: Anon at Jan 26, 2006 2:44:28 PM

Issue: Joe needs to be able to respond to emails using [email protected] or using [email protected]. is the main address that is used when configuring Outlook to use the Exchange server. is a web and email domain that is handled by the same mail server.

This will work when you are sending responses from your local network but does not work with the Exchange Web client.

1. Create a virtual server in the exchange manager to allow exchange to respond to the addresses. This also assumes that you have all of the DNS and other domain registration stuff set up correctly.

2. In Outlook, you have already set up your main logon account to connect to the local exchange server ([email protected]) and that works fine. To add the ability to send or reply to messages that need to be identified as being from [email protected], add a pop3 account to the email accounts in Outlook. Configure the pop and smtp servers to point to the local IP address (ie: or your valid internal exchange server address). Set the reply address to be [email protected] and set the login to use your main login name and password.

3: Exchange will let you send messages in this configuration but will give errors for receiving since it is not really a pop3 server. Not a problem. Since you are already receiving the messages to [email protected] through your main login (you added the additional address in the AD Users properties for the "Joe" account). To prevent the new POP3 account from giving error messages, you need to select "Options" in Outlook and go to the mail setup. Go to the send/receive setup. You will be able to select either the default or account. Select the new "" account and uncheck the automatically receive option and the error messages will disappear.

4: In Outlook, when you send a message, "account" will appear just to the right of the send button and you can select which account to use by selecting it from the pulldown.

Posted by: Jeff at Feb 22, 2006 4:39:45 PM

Exchange 2000 allows a user to have multiple SMTP addresses, but only one can be used as the primary SMTP address that is seen on all outgoing messages

We are in the middle of migration, we created script for automate the creating of SMTP addresses, and archived by mistake 4 primary SMTP proxy address so information you are providing is not accurate.

I am not sure which one of these addresses will be seen on outgoing
first one on the list ??????

I had to fired up ADSIedit and cleaned up,

I just wanted to let you all

Best regards, Good Luck
Oz Ozugurlu
MCSE 2003 M+,S+, CCNA
Http:// (Blog)

Posted by: oz at Apr 26, 2006 3:18:42 PM

It appears that primary smtp aliases are identified solely by the weather or
not “SMTP” is in caps. There is nothing that prevent you from adding
multiple aliases with SMTP in all caps through scripts or ADSI edit. Once
the condition exists, it cannot be corrected through the GUI. When setting a
new alias to primary throught the GUI, it simply goes through the list until
it finds an alias with all caps SMTP, changes it to lowercase and stops.

The real question to be answered here is, “How will exchange react to this
condition of multiple primary smtp aliases?” My gut tells me that it will
use the 1st one it comes to that has all caps SMTP.

Posted by: oz at Apr 27, 2006 12:34:40 PM

Explanation came From Jason Pape, who is our Senior AD Engineer, I am not a
scripting Kid, yet (-: working on it

But it is weird that we made me see thing in different way I think knowing
scripting is awesome, the was Exchange distinguish the Primary SMTP address
by reading the Capitalization, that is how exchange know which address is
primary, now if you try to do this within the GUI, exchange will tell you
sorry buddy you have one already, can not have another one
If you Fireup ADSIedit go to properties of same user add additional SMTP
Exchange gets Fulled and accept all those, SMTP addresses as primary happly
I am thinking Jason discovered something Cool

The question is which one is real Primary SMTP

I will test and post it later one

Thanks for the thoughts

Best regards, Good Luck
Oz Ozugurlu
MCSE 2003 M+,S+, CCNA
Http:// (Blog)

Posted by: oz at Apr 27, 2006 12:36:38 PM

SMTP Configuration
can someone please advise?
we are trying to set up direct SMTP connections for a server situated in a low bandwidth area hosting an Exchange 2003 server. All the users on this server are using the same domain space address as all other users on other servers.
This Server is already part of Front-End Back-End Architecture and is working correctly. The aim is to use the default SMTP virtual server to send Outbound email directly to the Internet which works.
the issue we have is when sending to local users on other back-end servers that are already part of the Front-End Back-end architecture, email will not deliver and just sits in the queue.
Is there a way that we can get this to work?

Posted by: Fab at May 30, 2006 6:39:19 PM

Dear All,

We got 2 Branch (one in USA & Second is in Mumbai)
Our Mail Server (MDaemon Mail Server) which is Locate at USA.
So User connects directly to USA Mail Server.
Now management as decided to install Exchange 2003 locally and route all internal mail through Exchange. We do not want to remove MDaemon Mail Server.
In MDaemon Mail Server I have forward User mails pointing to local Exchange Server.
But I do not know how to configure Exchange Server so that I get mails from MDaemon Mail Server.

Please help me or give me nay link from where I can get the help for above problem.


Girish Jain
System Administrator

Posted by: Girish Jain at Feb 20, 2007 1:21:52 AM

I have one more variant to this that I cannot figure out.

I have two domains hosted on one Exchange server. All my users log in and authenticate against my primary domain ( Now two users are a separate company ( but are business partners with and in our physical office space. Mail can some in to [email protected], but Bill *ONLY* checks mail as [email protected]. How can I have Exchange move mail from [email protected] to [email protected]?

By default Exchange receives mail at and since Bill logs in an authenticate against, the Exchange accepts this inbound email, but as noted above, he does not get the mail.

Seems it would be trivial to put a rule in place to accept the mail and put it properly into his mailbox.


Posted by: Bob Collins at Oct 3, 2007 9:21:13 AM

SMTP Help!

Can somebody help. I added a second exchange server to the same administrative group, and use the same SMTP connector to send messages through a gateway server. Moved some existing mailboxes from the exchange1 server to the new server. Now the mail from users in the new exchange are going through the gateway server with a non-primary smtp address, despite that they have the right primary smtp address setup. Why the new server is changing the primary smtp address? what is missing?

Posted by: Leo Figueroa at Jul 3, 2009 7:21:53 AM

How can I setup my MS outlook 2007 to automatically send emails to exchange and pop3/smtp contacts when both addresses are in the same email.

Posted by: Ravindran at Feb 20, 2010 1:07:15 AM

How can I setup my MS outlook 2007 to automatically send emails to exchange and pop3/smtp contacts when both addresses are in the same email.For ex. I want to send an email to my local exchange contacts and also to a pop3 contact simultaneaously. How will I be able to achieve this.

currently I recieve a

Posted by: Ravindran at Feb 20, 2010 1:16:24 AM

Jeff You saved my day :)

Posted by: Ronen at May 17, 2010 9:55:50 AM