Stop "Site Admin Email Changed" Notifications
Prevents the email sent to the old address when the site's administration email address is changed in Settings > General.
Snippet Library
Email snippets for WordPress
Snippets for the emails WordPress sends: change the sender name and address, add a Reply-To header, send HTML email and turn off notifications you do not need. For site owners who want their messages to arrive and look right.
Stop Login Details Emails to New Users
Prevents WordPress from emailing new users their login details when an account is created, for sites that onboard users another way.
Stop New User Notifications to the Admin
Prevents the "New user registration" email that is sent to the site admin every time someone registers. The welcome email to the user still goes out.