Notify a user about when he sent comment or form via Contact Form 7
Create simple, yet powerful dynamic email templates that are commonly used in application style websites. For developers / advanced users ONLY.
Remove known spammer email addresses from wp_mail()'s To, Cc, and Bcc fields.
Email testing for WordPress.
Send emails throught Sakshamapp ES email system from your WordPress installation using Sakshamapp ES.
Common functionality WordPress core should have but maybe shouldn't
WP Hotmail SMTP allows you to send all outgoing emails via Hotmail SMTP server from your WordPress site.
Email batcher that takes all the emails that would normally get sent out individually, compiles them into just one email, then sends it out once a day