I was having some issues with emails in Thunderbird looking encrypted and I was told repairing the folder it was in could fix that. So I did that and it did fix the issue. Then I was having issues with my sent email folder. I had emails in that folder going back to 2018 because I like to keep everything just in case I need to reference it for some reason. I email a lot and so there were probably 13-14,000 emails. It took a day or two to repair the sent email inbox and I couldn't hardly use my email at all while that was occurring because every time I would click on something, it would take 30-40 seconds to open it. Now, every time I send an email, my thunderbird freezes and becomes unresponsive until the email is copied into the sent email folder. It thankfully doesn't freeze as long this time and is still usable, any help on correcting this?