Here’s a slightly rough solution: delete your spam folder, but first make sure all the important emails from it have been moved to inbox or saved somewhere safely. Troubleshooting tip 2: Delete spam folder Go to your webmail and mark the junk emails as “not junk.” You can also go to the filter settings of your webmail provider and filter all the emails that you think are important but going to the junk folder and create a rule to always send them to inbox. Troubleshooting tip 1: Fix it from server sideįirstly, if you are using an IMAP email account, the chances are likely that this is happening from the server side, not from the client side. Whatever the reason is and wherever the fault is, below are some troubleshooting fixes that will likely fix this annoying error. In some cases, it’s not the fault of Thunderbird but the emails are being marked as junk from the server or your email provider. Sometimes, it’s not clear as to why this is happening and it can be hard to pin-point the exact cause. This unexpected behavior with your emails in Thunderbird is due to several reasons. Sometimes, manually moving the junk emails to inbox folder can work, but in other cases, Thunderbird will move them back to Junk folders and also flag new emails as junk too. Even if you repeatedly mark them yourself as “not junk,” it has no effect on Thunderbird.

There is sometimes a bug/error in Thunderbird where it keeps sending some or all of your emails to junk folder.

Thunderbird not receiving some emails