We're running zcs network edition 7.2.3 at work and I'm running zcs open source edition 8.0.3. at home.
When I send an email as a persona with my 8.0.3. install it is always send on behalf of the persona and not as the persona. In my "Sent" items it shows as "main account" send on behalf of "persona name" and on the receiving end sometimes in the same way (depends on the mail client) but in the header you can always see a "Sender:" field with the main accounts email address in it.
I tried the same thing at work (7.2.3) but there the mail is send as the persona and nowhere is the main account name to be found.
Also did a bug search but couldn't find anything for the 8.x release. Is it a bug or am I looking in the wrong direction?