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Was there a new update last night? Now my filtering is broken

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I use oodles of filters to make my inbox manageable. I also use a mail forwarding account at Cornell for my main email address. Up until this morning at 6:17AM, when email was send to my forwarding address at Cornell, it came in through my ISP as regular mail and Thunderbird applied the filters correctly. But then this morning at 6:17AM, all my mail from my forwarding address is now marked in the subject line as [ViaCornell] and none of the filters are working.

At the top of each message that was forwarded by Cornell I now see:

"This message was originally sent to your Cornell University Email Address: XXX@cornell.edu From: YYY<ZZZ@AAA.com>.

You received this message because you have configured your Cornell University Email to forward all mail to BBB@CCC.com."

Was there an update to Thunderbird last night that added this feature? If so, is there any way I can go back and get the version before this update, when the email filters all worked as expected? Because now my inbox is hopelessly drowned in junk since none of the filters are working.

I use oodles of filters to make my inbox manageable. I also use a mail forwarding account at Cornell for my main email address. Up until this morning at 6:17AM, when email was send to my forwarding address at Cornell, it came in through my ISP as regular mail and Thunderbird applied the filters correctly. But then this morning at 6:17AM, all my mail from my forwarding address is now marked in the subject line as [ViaCornell] and none of the filters are working. At the top of each message that was forwarded by Cornell I now see: "This message was originally sent to your Cornell University Email Address: XXX@cornell.edu From: YYY<ZZZ@AAA.com>. You received this message because you have configured your Cornell University Email to forward all mail to BBB@CCC.com." Was there an update to Thunderbird last night that added this feature? If so, is there any way I can go back and get the version before this update, when the email filters all worked as expected? Because now my inbox is hopelessly drowned in junk since none of the filters are working.

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At the top of each message that was forwarded by Cornell I now see: "This message was originally sent to your Cornell University Email Address ..."

That's nothing Thunderbird is adding. You'll need to talk to the folks at Cornell University.