When changing the server settings for how to send e-mail, it's nice to give

people the option to test it (so they don't have to create a fake review

request and jump through a bunch of hoops). This change adds a new check-box

that allows users to trigger such an email after the form is saved.
This doesn't cover 100% of the things that can go wrong with sending e-mails

(such as random SPF/DKIM failures or mail servers that don't like the

Sender/From distinction), but it should be good enough to verify that you typed

your SMTP credentials correctly.
This also organizes the e-mail settings into three sections.

Set my e-mail backend to console and saved the form with this check-box set.

Saw that it "sent" an e-mail from the correct Sender (noreply) to my user's

configured e-mail address.