Hopefully, I can explain this to where it makes sense. I have been having a long term issue with Thunderbird replacing received emails with existing emails that I have already received. Example: I get an email from [email protected] titled "Hello." I get an email after that from [email protected] titled "Need Your Help." Thunderbird will replace the email from [email protected] with the email from [email protected] and then I have two emails from [email protected] in my inbox and the one from [email protected] is gone. If I sign into my webmail client, both the emails from [email protected] and [email protected] are there with no duplicates like in Thunderbird. So, this indicates to me this is a Thunderbird issue. It happens randomly too. Sometimes I can go days without this happening and then suddenly it happens multiple times a day over several days. Is anyone else having this issue and is there a solution?