Exchange - Net Admin - Outlook
Windows Mobile - Windows

Contact - Director's Blog

Exchange Server Home

Exchange Consultancy

Exchange Resources

Microsoft Exchange
Amazon Store

Basic Email Gateway Server

Company wide Contact List

Disabled User Account

Distribution Lists

DNS Configuration

Exchange and a
Dynamic IP Address

Event ID 1221

Filter Unknown Users

Global Mailbox Folder
Permissions from Server

Intelligent Message Filter

Internal Email Address
for External People

Mailbox and Management
Account

Message Tracking

Migrating to a new server

Multiple Domains

Offline Address Book Errors

Options when a Staff Member
Leaves

Outlook Web Access

PDAs, OMA and EAS

Permissions Best Practises

Post Install Configuration

Public Folders

Prerequisites for Exchange
System Tools

RPC over HTTPS

Secure your SMTP Relay

Shutdown Script

SMTP Services and Exchange

SMTP Diagnostics

Spam Cleanup

Switching From POP3
to SMTP Delivery

Telnet Test

Username Change

Exchange Server Compatibility Information Exchange Server Version Compatibility 5.5* No 2000 Yes 2003 Yes 2007 Yes * May Adapt (More Information)

Two Domains One User
Author: Simon Butler, Exchange MVP, MCSE

After introducing a second email domain to Exchange, you may be required to allow a single user to be able to reply from multiple domains. There are a number of techniques that can be used to achieve this.

1. Two email accounts and use the "From" field in Outlook.
   This method does not involve any third party products, but does require that the user selects the correct account for the email to come from.
   1. Create two (or more) accounts - one for each email address that needs to be used.
   2. Modify the email address properties of each account so that the correct email address is the primary. You should disable the option "Automatically update email addresses based on recipient policy".
   3. Decide which account is going to be the primary user account. This is the account that all email is received on and is the account which the user logs in to the network using. Put strong passwords on to the other accounts so that they cannot be abused.
   4. Grant "Send As" permissions on each of the additional accounts to the primary account. For Exchange 2003 this is done the Security tab. If you cannot see the security tab in the Properties of the user, choose View, Advanced Features. In Exchange 2007 this setting is changed using the "Manage Send As Permission" option in the Exchange Management Console.
   5. For Exchange 2000/2003, on the "Exchange General" tab of each additional account, go in to "Delivery Options" and set a "Forwarding Address" of the primary account. Do not select the option to keep a copy of the email.
      For Exchange 2007, on the Mail Flow Settings tab, choose "Delivery Options" and set a "Forwarding Address" to the primary account. Do not select the option to deliver to both the forwarding address and the mailbox. .
   6. On the primary account, configure Outlook in the normal way. Then open a new message and activate the From field from the View menu.

   The user simple clicks on the From button and selects one of the other accounts from the list. If using a version of Outlook that supports "Auto Complete" then this only needs to be done once, as the Auto Complete feature can be used for future entries.
   You could also use a Macro (see below)

   All new email comes in to the primary account. No copies are stored elsewhere.

   Issues

   There are a number of issues with this method, which need to be taken in to account as to its suitability for deployment on your network.

   • Outlook Web Access Support.
     This method doesn't work in Outlook Web Access as OWA doesn't have support for the From field.
   • Identifying which address the email came to.
     In order to identify which email address was used, you have to look at the Internet headers of the email message to identify the original email address.

   Other Accounts Visible in the Global Address List
   To allow Outlook to select the other accounts to use in the From field, they must be visible in the GAL. This may cause confusion for other users.
   A work around for this is to add the account to the user's local contact list. You MUST add the contact from the GAL, so it will need to be visible for a short while. Find the other account in the Address Book through Outlook. Right click on the address and choose "Add to Contacts". Outlook can now resolve the email address to the correct account.

   Macro for Email Creation

   If you decide to use the From field method, then you could use a Macro to create the email message with the From field already populated. Provide the user with a button and when they want to send an email as the other address, they simply click on the box. More information on creating the macro is here.
   
   

2. Third Party Application.
   A third party application has been written which may prove to be more acceptable to your users.
   It is called "Choose From" and can be found here: http://www.ivasoft.biz/choosefrom.shtml
   If you need support for OWA then you will need to purchase the OWA variant as well: http://www.ivasoft.biz/choosefromowa.shtml. This application only supports Exchange 2003.
    
3. Another Third Party Application
   Yet another third party application that may resolve the problem is now available. ExtraOutlook (http://www.hammerofgod.com/download.html) allows two profiles to run at the same time. However do be careful with the application - if you have tools that send email via Outlook automatically it may send via the "wrong" account. It also can confuse desktop search applications, including the built in one within Vista.