John Long raises some good points. It seems pretty haphazard the way
things are now. I think I would purge Mutt and Postfix and then start over
in an orderly fashion.
Having said that, it appears after searching the web that many many people
have trouble sending mail with a GoDaddy account. Specifically,
authentication seems to be problematic.
The references I found were not mutt specific, but tend to point to a
problem with GoDaddy in general.
http://www.computerrepairhouston.net/wpress/blog/godaddy-smtp-server-problem-get-530-error-cant-authenticate-to-smtpout-secureserver-net/
https://www.google.se/webhp?tab=ww&ei=wiVfVNqmBZDcaqP1gJAC&ved=0CAkQ1S4#q=authentication+error+godaddy+email
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John