Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Inbox files are marked as read upon starting Thunderbird

I have an email configured as IMAP in Mozilla Thunderbird, and the issue is, that whenever an email arrives it almost immediately gets marked as read, the same happens when I open up a Thunderbird program, I can see this, from online email application. Display settings are marked to never mark emails as read, and the same isn't enabled on Junk filtering. Where else might be the issue ?

I have an email configured as IMAP in Mozilla Thunderbird, and the issue is, that whenever an email arrives it almost immediately gets marked as read, the same happens when I open up a Thunderbird program, I can see this, from online email application. Display settings are marked to never mark emails as read, and the same isn't enabled on Junk filtering. Where else might be the issue ?

Chosen solution

Okay, apparently, when POP downloads emails from server it automatically gets marked as read.

Read this answer in context 👍 0

All Replies (2)

EDIT: Mail is configured ona few other computers as POP3, so it shouldn't affect it. Tested with their Thunderbird applications turned off.

Chosen Solution

Okay, apparently, when POP downloads emails from server it automatically gets marked as read.