This article details how to encrypt forwarded email messages to group or mailing list.
You can configure PGP Desktop to encrypt email messages sent to a group email address by creating a policy for your PGP Messaging service.
A messaging policy is a set of one or more instructions that tell PGP Desktop what to do in specific situations. A service can have more than one policy associated with it. When deciding how to handle a specific outgoing email message, PGP Desktop checks the policies configured for the service one at a time (from the top of the list going down). When it finds a policy that applies, it stops checking policies and implements the policy that applies.
Use the following to ensure your email messages are encrypted to all recipients of a group or mailing list.