How to change my the From: address in mutt?
Either start reading up on mutt's configuration, or export [email protected] from your `.bashrc'
As others have noted, it's most likely that the best way to address your situation is by editing ~/.muttrc appropriately. However, for those who stumble on this question looking for a "one-time" way to change the value of the 'From' header, you can simply use Esc f.