Type: string
Default: ""
This format strings specifies a command which is used to decode application/pgp attachments.
The PGP command formats have their own set of printf-like sequences:
%p Expands to PGPPASSFD=0 when a pass phrase
is needed, to an empty string otherwise.
Note: This may be used with a %? construct.
%f Expands to the name of a file containing
a message.
%s Expands to the name of a file containing
the signature part of a multipart/signed
attachment when verifying it.
%a The value of pgp_sign_as.
%r One or more key IDs.
For examples on how to configure these formats for the various versions of PGP which are floating around, see the pgp*.rc and gpg.rc files in the samples/ subdirectory which has been installed on your system alongside the documentation.