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You cannot do that it will not work. You can only send from the primary email address. You can set you the second email address as a separate user and then give send permissions that is the only way it will work. The separate user make sure and have it forward all mail it gets to the primary user. 
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You cannot do that it will not work. You can only send from the primary email address. You can set you the second email address as a separate user and then give send permissions that is the only way it will work. The separate user make sure and have it forward all mail it gets to the primary user.

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I have a SBS 2008 server and just created a secondary email domain. The same user has 2 email addresses like user@domain1.com and user@domain2.com. The domain1.com is the primary email account. if I try to send and email from domain2.com from the same user I get a NDR message I don't have permissions to send. The send as permissions are all user based not email account based. How can I set the permission to send from the secondary email account from the same user
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I have a SBS 2008 server and just created a secondary email domain. The same user has 2 email addresses like user@domain1.com and user@domain2.com. The domain1.com is the primary email account. if I try to send and email from domain2.com from the same user I get a NDR message I don't have permissions to send. The send as permissions are all user based not email account based. How can I set the permission to send from the secondary email account from the same user

Secondary email domain on SBS Server

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).