Whether or not the current message is signed.
def get_message_signed() -> bool: ...
message_signed = property(get_message_signed, None)
This property indicates whether or not the current message is signed. This property will return true if the current message appears to be signed, according to the value of message_headers.
Note that a message that is both signed and encrypted will not appear to be signed until after it is decrypted.
This property is read-only.