||Abstract mailet providing common SMIME signature services.
It can be subclassed to make authoring signing mailets simple.
By extending it and overriding one or more of the following methods a new behaviour can
be quickly created without the author having to address any issue other than
the relevant one:
Verifies the s/mime signature of a message.
||This mailet decrypts a s/mime encrypted message.
||Puts a server-side SMIME signature on a message.
It is a concrete subclass of
SMIMEAbstractSign, with very few modifications to it.