How to send mail from Mutt?

["Thomas H. George" <lists@tomgeorge.info>]

I used to be able to send mail from Mutt but I got a new email address 
and it no longer works.

In Mozilla mail preferences I have set use "outgoing.verizon.net" for 
outgoing SMTP but I found nothing regarding such a setting in muttrc.  
Or perhaps, if it is there, I don't understand the entry.   Could this 
be the problem or should I look elsewhere?

Tom George