https://ubuntu.com/docs/launchpad/developer/explanation/core-components-and-set-up/parts-of-launchpad/mail/
Launchpad mail - Launchpad manual
Overview of email types in Launchpad and how the are configured.
launchpad mailmanual
https://lists.ubuntu.com/archives/bazaar/2010q2/069022.html
continuing anothers work - launchpad merge proposals, mail spam
continuinganothersworklaunchpadmerge