please add email header for "** Branch linked..." emails

This morning I woke up to 100+ emails like the following:
"From: Launchpad Bug Tracker <email address hidden>
Reply-to: Bug 829657 <email address hidden>
...
Subject: [Bug 829657] Re: linux-mvl-dove: 2.6.32-418.35 -proposed tracker
...
Message-id: <email address hidden>

** Branch linked: lp:ubuntu/maverick-proposed/linux-mvl-dove
..."

I find these quite annoying and I'm not sure how they are useful. Perhaps they are to someone, but I think it would be good to add a header, perhaps 'X-launchpad-bug-branch-linked' so that these can be more easily filtered. Right now I am attempting something silly like:

:0
* ^X-launchpad-bug-modifier: Launchpad Janitor
* ^References: <.*malonedeb@soybean\.canonical\.com>
* ^Message-id: <.*launchpad@ackee\.canonical\.com>
.INBOX.Ubuntu.bulk/

Note that while I could do a body search, I think it would be useful to have a something lightweight to filter and something that is specific to these 'Branch linked' emails so too much isn't getting filtered out.

Thanks!