Hello, In the Message; Subject : [oS-en] Finding duplicates in email Message-ID : <f7e5e28d-3a25-1ed0-0f62-9c6b5246a9ec@telefonica.net> Date & Time: Tue, 4 Jul 2023 10:35:00 +0200 (CEST) [CER] == "Carlos E. R." <robin.listas@telefonica.net> has written: CER> I have a large mail folder, with 20000 mails, of which probably CER> thousands are duplicates. I can see them with my eyes. Yah, duplicate e-mails are so depressing. In my case, with the .procmailrc setup, there are no duplicate emails at all. CER> I have a thunderbird extension to find duplicates. "Remove CER> Duplicate Messages" by Eyal CER> Rozenberg. https://github.com/eyalroz/removedupes/ CER> But it claims there are no duplicates. CER> I have read the FAQ. Subsequently, I saved to file a message and CER> its duplicate, to do a compare, and yes, there is a difference: [...] CER> The reason of that difference, is that each copy comes from a CER> different run of my sorting script, the spam filter "thought CER> differently". CER> (note to myself: disable spam filtering in that script) Duplicate mails should be determined by the unique Message-ID for each mail. CER> Do you know some other tool to find and remove duplicates from a CER> mail folder, CER> where I can tell it to ignore some header? CER> ("Delete" means moving to trash folder) Is there no function in Thunderbird to determine duplicate messages by Message-ID? Regards. --- ┏━━┓彡 野宮 賢 mail-to: nomiya @ lake.dti.ne.jp ┃＼／彡 ┗━━┛ "A bachelor’s degree still holds prestige as a ticket to the middle class, but its value has received increasing scrutiny. In the last several years, rising tuition and student loan debt have led more Americans to reconsider an investment in postsecondary education." -- Washington Post --