You do not have permission to send on behalf of the specified user

you have go to be to @^@#&^#&@* kidding me…..that’s what I thought when a user called me and said they could not send an email as himself.  I was like BS…I didn’t mess with your exchange permissions.  One excerdin pill for my headache and three hours later….I found the solution that worked for my situation (I’m not saying that will work for YOUR situation..but it DID for mine)

 Anyways, the PC stored the password for the exchange profile and I ended up adding another profile and deleting the initial profile (cause I messed up)…and now the PC still had the old password saved but using the new profile…so now the user received the now infamous “‘You do not have permission to send on behalf of the specified user’” message.

**The Fix**

1. Go to Start -> Run -> Type control keymgr.dll

2. Now you can either delete the stored password for your FQDN exchange server or edit it and make sure the username and password are correct

Hopefully this helps someone!