all that because I  have a constant flow of more than 300 messages per day, each of the exact messages that I want to filter by body content are ctually smaller than 4k .

Hello, I have many mail filters. - more than 15 Some of them are for sender, recipient or subject and all of them are working fine. I recently felt the need to filter messages by body content. I enabled "keep messages locally for this account" then I went to the storage options and I left the Inbox only , unchecked the others, then I set my thunderbird not to download messages larger than 10k all that because I have a constant flow of more than 300 messages per day, each of the exact messages that I want to filter by body content are ctually smaller than 4k . OK, everything is fine, I restart my TB and observe the following issue: mails are downloaded, but filters are not applied automatically= messages just stay in Inbox , When I go to tools -> apply filters on folder everything is OK - filters are applied. Then they cluster in the inbox again. Filters work fine if I disable the Body filter. Filters are not applied if I enable "save locally" for all message folders. My TB folder is more than 320G when all messages are downloaded, so this is not an option at all. I am using Mint Linux on a thinkpad T530 TB = 24.3.0 can you help? Regards Kate