[Evolution] Delete email (spam) without opening it

[Paul <mrpaul posteo de>]

Some spam contains images that I cant block. I assume its javascript.
I'm getting increasingly concerned about these image confirming my
email address to spammers.

Occasionally I receive such messages and know they are spam before I
open them. I would like to delete these messages without opening them.
Seems like a fairly basic security measure but I can't for the life of
me work out how to do that. Right clicking a message opens it (as does
left clicking of course).

How can I select a message without opening it?