If I set up a mail forward so that john@mycompany.com is directed to john123@gmail.com, and then monitor john123@gmail.com in Outlook using IMAP, will Outlook (or can it be made to) reply to emails send to john@mycompany.com as that email?
In other words can I maintain the illusion without the person I reply to randomly seeing references to my gmail account?
EDIT: I was doing some testing... When I sent from john123@gmail.com AS john@mycompany.com, Outlook displays the incoming email as "john123@gmail.com on behalf of john@mycompany.com". I guess this means gmail's forwarding is not especially useful, is there a workaround? All my POP-based mail is rubbish compared to gmail...