Reply-to: question

[slackware98]

Hello.. hopefully this gets to someone who can help me.  I love using 
mutt, but I cannot figure out how to set it to include a reply-to address 
for my outgoing mail.  I am on a standalone computer and use my 
non-existant hostname, but would like a reply-to address to be listed so 
people can reply to the right address.  Can someone out there help a 
fellow mutt user?  Thanks..