This RT extension allows your RT 3.6 instance to verify GPG signatures on incoming mail. To use the GPG signature verification, you need to do the following: Set up a gnupg key directory with a pubring containing only the keys you care about and specify the following in your SiteConfig.pm Set($RT::GPGKeyDir, "/path/to/keyring-directory"); @RT::MailPlugins = qw(Auth::MailFrom Filter::SimpleGPGVerify); You'll also want to have a configuration file (gpg.conf) that looks like this in your GPG keyring directory: keyserver pgp.mit.edu keyserver-options honor-http-proxy,auto-key-retrieve Copyright 2007 Best Practical Solutions, LLC