It is not clear to me what you're trying to achieve. If 'check' means inspecting the subject and the sender of a message you can do that without opening it. You cannot inspect the contents of the message without opening it.

LINDAANNE said

Is there a way to check and delete emails without opening them?? I can just look at the emails and decide I want to delete without opening each one and deleting.

Hi, Can I open Mozilla. Check what I want to delete, and then delete. I do not need to open the emails. I would like to be able to check numerous emails, and then delete them all at once , without opening them. I am now doing each email individually, which takes tooooo much time. Some are just advertisements I do not need to open.

There are no check boxes for selecting messages as you can see in Thunderbird. Standard computer selection methods that have been around for years work. Here is how that works.

https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/windows_fcab_select_files.mspx?mfr=true

LINDAANNE said

Is there a way to check and delete emails without opening them?? I can just look at the emails and decide I want to delete without opening each one and deleting.

Thank you. Makes it so much easier.