Another reason to use gmail

Official Gmail Blog: Send mail from another address without "on behalf of"

Quite a few of you use Gmail's custom "From:" to send messages with one of your other email addresses listed in place of your Gmail address. Since these messages are sent by Gmail's servers but "from" a non-Gmail address, we have to include your original Gmail username in the "Sender" field of the message header to comply with mail delivery protocols and help prevent your mail from being marked as spam. Most email programs just display the "From" address and not the "Sender" field, but some (including versions of Microsoft Outlook) show these messages as coming "From username@gmail.com On Behalf Of customaddress@mydomain.com" which really annoyed people.