[Exim] return-path for webmail set as unix_account@hostname

Hi All,

Hope someone can help with this.

Whenever I use the webmail programs on my dedicated server to send out
email it comes through with the return-path as the
unix_account_name@hostname.

What I would like to see is the return-path as the email address of the
person sending the email like: aaronjw@???.

When I send email out via Outlook. it comes through just fine.

Does anyone know a setting in Exim I have to switch to get this to
happen? I already tried adding trusted_users = nobody to the exim.conf
file but that does nothing.

ANY help is appreciated.

Thanks!

Aaron