[Bug 119899]

[Kent-caspia]

WADA: (re your comment 131): I'm pretty sure that your a) and b) are
both implemented by TB 19. It is the alternatives that are quite
difficult, for example your c) would require filters to handle async
searches, which are quite difficult given the current architecture.

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https://bugs.launchpad.net/bugs/119899

Title:
  After-the-fact Filters on custom header won't match for IMAP messages

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