Hi, Deborah
It turns out that the Terminal approach suggested in my earlier post does work, in a stealthy sort of way.
The details are given in a post on macosxhints -
http://www.macosxhints.com/comment.php?mode=view&cid=11055 - explaining how to use Terminal commands to provide default Mail Reply-To and Bcc addresses. In Terminal, use the following command to specify the desired defaults addresses:
defaults write com.apple.mail UserHeaders '{"Reply-To" = "
mydefaultreplytoaddress"; "Bcc" = "
mydefaultbccaddress"; }'
Be careful of the syntax, especially the ";"s. Obviously, replace the italicized addresses with those you want.
Verify that they have been successfully entered using:
defaults read com.apple.mail UserHeaders
The stealth part of this is that these default addresses are not visible when you are preparing an outgoing message. When you send the message, these default addresses are in fact acted upon. Vlad pointed this out to me in another thread.
Bob