Update:
I asked a sort of similar question regarding the "from" at the top and here is the response :
http://portal.smartertools.com/community/a87267/how-to-select-a-different-from-.aspx
Basically you set up all the accounts you need.
Pick what will be your main account (personal name ?)
Then go into settings and add the others as "smtp" accounts. Now you can send from them, from your main account. You can set up multiple signatures as well, so when you send from sales it is the sales signature
And to get the emails that are sent to sales, you can either use the forwarding as option (1) I said above, or use message retrieval. either way will get the job done.
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