To create a signature set the variables sign and Sign in the .mailrc file. For example:
set sign='Lost in hyperspace'
This creates the signature Lost in hyperspace that the user can add to the end of their mail messages.
set Sign='Fax: +44 31 453 9732'
This creates the signature Fax: +44 31 453 9732 that the user can add to the end of their mail messages.