Remove known spammer email addresses from wp_mail()'s To, Cc, and Bcc fields.
Automatically configure WordPress to use SES when on an EC2 instance with a SES capable role.
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
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
Use an alternative mailer solution, other than PHPMailer in WordPress installations.
Use multiple SMTP servers to send WordPress emails (wp_mail())
Reconfigures WordPress' WP_Mail function to use Amazon's Simple Email Service.
Configure a mail server you want to use for mailing in WordPress
Notify a user about when he sent comment or form via Contact Form 7