[TxMt] "Edit in Textmate" failing for Mail.app?

I've followed the steps Allan recommends in his 2006/textmate-tricks blog entry:

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install the Edit in TextMate input manager, which is done by clicking the gear menu in the status bar (inside TextMate), navigating to the TextMate submenu and selecting Install "Edit in TextMate"

I relaunched all apps and my computer and confirmed that an "Edit in TextMate" alias is now in my ~/Library/InputManagers directory. But I seel no new edit item in my Mail.app pulldowns, and Ctrl-Cmd-E does nothing :(

I'm running TextMate 1.5.7, Mail.app 3.5 on OS 10.5.6. Does this trick not work in Panther, and/or are there any workarounds?

Thanks!

jon /RR