How to display the size of single emails?

Question

I would like to be able to see the size of every email in my Thunderbird. I know how to check the size of a mail folder but not for a single mail.

How can I accomplish this?

Answer 1

To choose columns, click on the icon which appears at the right edge of the column headings. You'll be shown a drop-down menu of columns; the headings with checkmarks are the ones that are currently shown in your mail folders.

Select Size.