You don't need a full-featured MTA to send mail to your ISP's (or anyone
else's) full-featured MTA.
MTAs are *very* complex applications that do things you don't need done.
A LOT of things you don't need to do unless you are running a mailserver
for an ISP or a major LAN, etc.
A "naive" smtp client (that just sends your mail to your ISP's MTA) can be
as tiny as a 2K shell script, but most of us use a compiled program like
ssmtp, which has a 5 line configuration file and is only 20K. There are
others too. (Sometimes called "sendmail emulations")
Install ssmtp and you will be up and running in 5 minutes and never need
to touch the program again. Any number of people that frequent
comp.mail.misc (and probably comp.mail.sendmail) can walk you through it.
Then you just point your Mutt at it.
Pass-List -----> Block-List ----> Challenge-Response
The key to taking control of your mailbox. Design Parameters:
Challenge-Response links -- http://www.yqcomputer.com/