Unset smime

beaglebone.txt

 # this set the number of seconds to keep in memory the passphrase used to encrypt/sign
 set pgp_timeout=60
 
-# automatically sign and encrypt
+# automatically sign and encrypt with PGP/MIME
+unset smime_is_default
 set pgp_autosign         # autosign all outgoing mails
 set pgp_replyencrypt     # autocrypt replies to crypted
 set pgp_replysign        # autosign replies to signed