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On Monday 02 December 2002 03.46, Ole Kofoed Hansen wrote:
Even though a MUA should never send out 2 messages with the same ID, any MUA should happily accept having more than one mail with the same ID in a mailbox, because that can easily happen in legal ways.
One possible scenario: I am subscribed to 2 low-volume mailing lists. Their subjects are related, so they get the same types of questions. Because of their low volume, I have them in the same mail folder. Now, one guy is desparate for a solution to a problem, so he sends To: list1, list2. Result: I have 2 messages with the same ID in the same folder.
I'm aware, and it has been noted as a bug in kmail. But until that gets sorted there is a need for a work-around, such as deleting mails with identical message IDs. As a side note, it's a good idea to do that anyway. If people select "reply all" you'll still only get one mail.