iOS 13 email options - press firmly for pop-up as well as hold down with two fingers for deletion
Pressing firmly on your email is a nice option when the email pops up and you can get a nice view of the email. You can also forward, delete, etc. The nice thing is the email itself will still show as being not read.
Another quick one is to hold down with two fingers and the option to delete will come up. You can then scroll down and have mass deletion.