Guam is an intelligent reverse IMAP proxy that applies rulesets to commands, command results and payload, provided context.
Current features include filtering groupware folders from IMAP folder operations, such that IMAP clients that do not understand Kolab Groupware folders are not shown those folders.
Future features include Data-Loss Prevention (DLP) capabilities and Audit Trail integration.
Guam is a Kolab product hosted at Phabricator:
Project URL: https://git.kolab.org/tag/guam/
Git URL (anonymous): https://git.kolab.org/diffusion/G/guam.git
Git URL (authorized): ssh://firstname.lastname@example.org/diffusion/G/guam.git