Question : Send As not retaining settings in AD

I am trying to give permission to a user who needs to send an email as someone else.
i have done this many times from AD by going to the Security tab, add user, then check Send As.

The issue is, after about an hour the user i added disappears, its driving me crazy i do not know whats causing this problem, I also tried adding a group and again it's gone.

I'm logged in as Administrator, my personal account can "Send As" that user as i am a member of domain admin group.

I also tried assigning  the same permission from the Server Management console but it does not provide the security tab.

Using SBS 2003, AD, Exchange 2003.

Answer : Send As not retaining settings in AD

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