User Feature Request:
When subscribing to cards, the emails sent upon changes of a card do not provide "References"  and neither "In-Reply-To"  headers. So changes to the same card are completely unrelated emails .
Thereby grouping or in general handling of the card subscription emails becomes unnecessarily really hard.
 See for example http://www.ietf.org/rfc/rfc2822.txt
 Email clients cannot match messages on the subject alone, as the email subject contains the name person who changed the card. And that might differ between changes to the same card.
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