Mailbird does not have the ability to automatically mark an email as Read, or to automatically delete an email.

If one of your emails appears to have been automatically marked as Read (or even deleted), then the most likely cause is that it was marked as Read (or deleted) by another email client, or via your webmail.

Mailbird simply syncs with your email server, and it is unable to take any such actions by itself.

The most common reason for witnessing this sort of behavior is that you have set up your email account as IMAP in Mailbird, but have also set it up as POP3 in another email client.

If you currently have this setup (which is not ideal), your other email client will delete the emails you receive from the server (as is standard procedure for POP3 email accounts) after they have been downloaded, but since Mailbird is using IMAP, it will then sync to the email server and will not display the missing email because it has already been deleted by the other email client which is using POP3.

In order to establish which email client might be causing this undesired behavior, disable all of your email clients except for Mailbird, including any mobile/tablet email clients. Then try turning them on one by one, so that when the issue begins to appear you will know which email client is causing the issue.

Hopefully you have found this article useful, but if you still require assistance, please do not hesitate to contact our Customer Happiness Team by clicking here.