On many of my sent emails from Account#2, it is also displaying my Account#1 email address rather than only my Account#2 email that i am actually sending from.  It will say "sent from Account#1 on behalf of Account#2" (even though I'm sending from Account#2).

I either select Account#2 as the sender when composing an email, or reply to an email sent to Account#2, and it instead displays my Account#1 email address first, which is intended to be private and is the whole point of using Account#2.  Account#1 I use only for personal contacts, and Account#2 I use anytime I have to sign up for something and/or submit my address into a form which most certainly acquires spam.  I've been able to keep Account#1 mostly spam free with this method.  It's also an issue of personal privacy & security.

So what's happening now is that my private account (#1) is now being displayed to all the public recipients who can now collect my email and spam me.  It has also caused problems with mailing lists b/c my messages are coming from an email which is not subscribed to the list.  This didn't use to happen and even now still doesn't happen every time I sent from Account#2. It seems to be intermittent, but i haven't looked into it deeply enough to find the pattern.  Though it does occur on most sent emails from Account#2.

When i searched Outlook Help for this it said to even enable this feature you have to be using Exchange, which i am not, so i don't know how and why it's even happening.

thanks