Misleading “Encrypt” option

I’d highly recommend changing the label title for the “Encrypt” option to something more clear, e.g., “Hide the above settings after save”.

When I first used the plugin I thought it was some other kind of email encryption. Also, from looking through some of the reviews, it seems I’m not the only one that thought that.

Also, (minor) ‘already’ is misspelt in your “Rate my plugin” CTA:

Awesome, you’ve been using Mail SMTP Mailer for … . May we ask you to give it a 5-star rating on WordPress? | Ok, you deserved it | I **alredy** did | No, not good enough

Other than that, simple, great plugin!