ConversationSet error when searching or archiving: Closes #7275
We discovered a situation where, depending on the order email is processed, it's possible for logically associated emails to form two or more conversations. When an email is processed that belongs in more than one conversation, its removal triggers this error (as a Message-ID can be associated with one and only one conversation). Bogus email headers, especially email that does not list a complete References: list, aggravate this problem.
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