After using gmail for years and NOT having my outgoing mail from other accounts being sent as “sent on behfalf of,” gmail has now added it. (I just noticed it in a reply to from someone who sent me back the original e-mail in the thread and was shocked that he had my gmail account in there!)

I see the work-around, but wonder if you know which e-mail clients/servers out there do NOT send your e-mail out from other accounts as “on behalf of.” I have looked all over the web, but no one really seems to address this particular issue.