The Mutt E-Mail Client : Reference : Configuration variables : smime_is_default
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## 6.3.128. smime_is_default

Type: boolean
Default: no

The default behaviour of mutt is to use PGP on all auto-sign/encryption operations. To override and to use OpenSSL instead this must be set. However, this has no effect while replying, since mutt will automatically select the same application that was used to sign/encrypt the original message. (S/MIME only)

The Mutt E-Mail Client : Reference : Configuration variables : smime_is_default
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