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3.5.3.9 Signing the Message: ~a and ~A

To save you the effort of typing your signature at the end of each message, you can use ‘~a’ or ‘~A’ escapes. If your signature occupies one line only, save it to the variable sign and use ‘~a’ escape to insert it. Otherwise, if it is longer than one line, save it to a file, store the name of this file in the variable Sign, and use ‘~A’ escape to insert it into the message.