I'm rusty with Exchange 2003. I believe on the Security tab of the AD object you have to click the Advanced button and add the Send-As permission there.
However, if by "alias" you mean that you've simply added the address as a proxy address on the user, then I don't think it'll work. In that case, what I do is remove the alias (rebuild and update the RUS), create a distribution group called "Support" with the appropriate address (rebuild and update the RUS), and then add the user in question to that group and give him or her Send-As permissions on the group I just created.
Send As permissions can take up to two hours to take effect.
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by: McCombsExchangePosted on 2009-09-23 at 13:24:01ID: 25407520
Absolutely, you just need to grant them send-as permission via AD Users & Computers. It's on the Security tab. Then in Outlook, they will need to add the From field to the message -- Options tab -- Show From. Then they'll type the address from which they would like to send the message.