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Sending from multiple e-mail address from one SBS 2003 server


We have an SBS 2003 server currently configured to our primary business e-mail.  Being in the process of setting up a new company we are looking to achieve adding a further business e-mail to all users that they can send and receive e-mail from.  For instance each user will have the e-mail addresses;  user@mainbusiness.com and user@newbusiness.com.  I have easily been able to configure the server to receive e-mail to each user at the newbusiness.com domain name but I am struggling to enable them to send from that domain as outlook automatically sends from the default mainbusiness.com domain and does not allow a choice.

I can get round it by setting up a new user and subsequent mailbox for each user but this is not ideal and could lead to us maxing out the number of users on the SBS.  I am also aware that there is a 3rd party solution but currently it is not cost effective to purchase this.

Are there any solutions/options that I am missing?  Would a hosted exchange for this domain enable us to achieve this or would this still not work because outlook can't have two mailboxes open at any one time?

Any assistance greatly received.

Many thanks :-)
2 Solutions
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
With one account you wont be able to achieve this as one account\mailbox can only have one Primary email address so you will have to have another AD\Mailbox account and then give UserA "FullMailboxAccess" and "SendAs" right on UserB and then work.

If any doubts please let me know.

- Rancy
SarahWHAuthor Commented:

Thanks for your suggestion.  I have tried that as a work around but for some reason I was getting undeliverable message:  You do not have permission to send to this recipient.  For
assistance, contact your system administrator.  This seemed to only be when trying to send to another user on the same exchange server - not to external recipients

I will try again in case I made an error
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
There is no problem adding additional email domains to your SBS 2003.

First you need to add them... follow this for that:

Then, to be able to send from the secondary address you need to add a dummy pop-3 account to each user's Outlook.  See this for that:

Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
SendAs  - you mean UserA has rights to UserB ...... i cant think if NDR would come.

How did you give this rights .... as there isnt any difference in sending email from another user within Internal or External.

- Rancy
i assume you have bought the new domain name

then firstly u need to point the new domain name MX records to your mail server IP

so if you do MX lookup it matches your old domain IP

Then in exchange you need to add the new domain to be able to create email accounts as the new domain.

follow this and it will guide you through it


Then for a user to send an email under the new domain, u either add a SMTP under their AD settings or if its a generic email u simply give user 'SendAs' rights
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