Earlier in the year Yahoo suggested we recreate the connection from Thunderburd to use better security protocols which went very well until my mail started syncing. I was noticing so many emails arriving in my Thunderbird email box as of 2020 which actually i received back in 2018. I then realized the date they are showing as received is actually the date which they are being synced and not the actual arrival date. Here is a portion of the header of the email : X-Apparently-To: email@yahoo.com; Mon, 16 Apr 2018 14:42:23 +0000 I have tried repairing my inbox, deleting and recreating multiple times (and the received date is updated each time to show the new date). I have reviewed my email via yahoo and gmail (via my mobile) and the multiple emails in question are sorted in the correct manner (and I also re added my yahoo account into my gmail app and it also synced correctly). Picture shows emails received on 10/20/2020 but actually arrived on 4/16/2018 The issue; though i know is critical in any way but is frustrating as I am seeing all these older emails mixed in with new emails. Any help would be appreciated.