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When sending out most email Launchpad will include an X-Launchpad-Message-Rationale header which you can filter with.

Bugmail

The basic rationale headers are for the cases where you are directly related to a bug:

    X-Launchpad-Message-Rationale: Assignee
    X-Launchpad-Message-Rationale: Subscriber

If you are related to a bug through a team, an @ notation is added:

• X-Launchpad-Message-Rationale: Assignee @ubuntu-kernel-bugs X-Launchpad-Message-Rationale: Subscriber @ubuntu-core-dev

Bug Contacts and Registrants, which are implicitly subscribed to public bugs, have their own headers:

• X-Launchpad-Message-Rationale: Bug Contact (mozilla-firefox in ubuntu) X-Launchpad-Message-Rationale: Registrant (kiwi)

This is combined with the @ notation when you are a member of a team who is bug contact:

• X-Launchpad-Message-Rationale: Bug Contact (ubuntu) @ubuntu-bugs

If the notification was generated in a duplicate bug, we tack on a via string:

• X-Launchpad-Message-Rationale: Assignee via Bug 1332

This one is worth explaining a bit further. Let's say this bugmail is for bug 2129; the header here means you are the assignee of "master bug" 1332, of which 2129 is a duplicate. You can use this header to filter away bug that you are receiving from duplicates of a bug you are subscribed to.