Mutt is text-based email-client for Unix-like systems. People like it because of the geeky environment it provides and the ease with which it manages and loads your inbox. If you’re one of them then you might be facing the problem of invisible-signature i.e mails sent using mutt do not show your signature.
Here’s the solution to that.
We need to configure a file called .muttrc where all the mutt settings are stored. It is usually in home directory or in ~/.mutt/. Open this file to edit. Type in
set signature = ~/.mutt/sig # my signature file