Deleting a table from a Gmail email message might seem a bit complicated, as selected the whole table and pressing Delete key, or backspace, will only delete the data in the table, but leave the table skeleton.
In short, to remove entirely a table from the message : add text before and after the table, put the mouse cursor before the first text, hold Shift key, and click at the end of the text after table. Pressing Delete key will now delete the text + the full table.
In detail, starting with a fresh email including a table pasted from a spreadsheet
When trying to select the whole table – no table editing options are offered
Deleting the selecting will only empty the table – but not remove it from the mail
Selecting again the empty table, and trying to delete, either with backspace key, or delete key, won’t remove the table
Solution is to add text before and after the table, put the cursor at the beginning of the text before, and, while pressing the Shift key, click at the end of the text after the table.
Deleting the whole selection will remove the table from the mail !