Advanced WordPress Email delivery is a wordpress plugin being distributed by Codecanyon.Advanced WordPress Email delivery is an extension for WordPress email sending that adds features missing natively:
Advanced WordPress Email delivery Features :
“From” email field editor to replace WordPress defaults.
SMTP support to allow sending emails through an external server.
HTML emails with stylish template instead of plain text.
WYSYWYG template editor and previewer.
And many more. Check official website for more info