Send mail in 5 different ways: PHP mail(), MX Zone, SMTP Relay, Command Line or POP before SMTP, also you can use your Gmail account to send mails.
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.
Redirects all email sent through wordpress to the user currently logged in or the site administrator.
Reconfigures WordPress email to use secure SMTP such as Gmail. Plugin options are accessible through the admin panel.
Send an email in the future.
Reconfigures WordPress' WP_Mail function to use Amazon's Simple Email Service.
A simple plugin that replaces the default wp_mail function with PostMarkApp (http://postmarkapp.com/).
Log all calls to wp_mail() to a file wp-content/plugins/wp-mail-log/wp-mail-log.txt for debugging. Delete this file afterwards.