Embarrassed Aolers Need Email Alias!

Can anyone advise me how to help a friend who uses AOL as a primary email account? This user wants to send email from AOL, with an alias that is from another legitimate email account on a domain. The ISP can likely provide an alias that will allow all emails sent to the non-AOL address are forwarded, but when this user sends replies, the AOL address he sends from is what the receiver will get when “reply” is chosen. Further, can this AOL address be removed or prevented from being viewed in the header? By this I mean if a savvy user drills in to view header, will the AOL address be seen even after the solution that you may be prepared to propose?