Admin Notice When an Email Fails to Send
Shows administrators a warning in the dashboard when WordPress could not send an email, with the error message, so delivery problems are noticed quickly.
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.
Email All Users of a Role From the Admin
Adds Users > Email Users, where administrators can write a plain-text message and send it to every user with a chosen role, delivered in batches in the background.
Email Editors When a Post Is Submitted for Review
Notifies editors and administrators by email when a contributor submits a post for review, with a link to edit it.
Send a Test Email From the Admin
Adds a Tools > Send Test Email screen where administrators can send a test message to any address and see right away whether WordPress could hand it off.