In Bluemarble Webmail, how do I delete my message(s)?
Select the email you wish to delete by clicking on the box located on the left hand side of the screen that is linked w/ that specific email.

For instance, in this particular screenshot I have selected Message #5, the last one.

Once there is a check mark in the box click on “Delete” located on the left hand side of the screen and that will put a line through the email.

The last step is to click on “Purge Deleted,” which is located on the right hand side of the screen, and the message will disappear.