When I forward a message, I want my name and my email address in the body of
the message, right below my signature. This is how it used to appear:

-----Original Message-----
From: my name [mailto:my address]
Sent:
To:
Subject:
Importance:

For some reason, it has now switched to showing my user name for my server,
my server address, and then "on behalf of" the person who originally sent the
message:

From: User (my server user name) [mailtomy master server account)] On
Behalf Of (original sender)
Sent:
To:
Subject:

How do I fix this? This changed soon after I added a fourth email account,
but I don't know if that is the cause or it is just a coincidence.