WP Mail Bank reconfigures the PHP Mailer and make it more enhanced with advanced SMTP settings options.
Easily send emails from your WordPress blog using your preferred SMTP server
Saksh WP SMTP can help us to integrate SMTP to your wordpress installation. So that you don't need to use mail() function.
WP Simple Mail Sender is a very simple plugin to change the sender address and name in outgoing emails.
Version: 3.1 Configure SMTP mailing in WordPress, including support for sending e-mail via SSL/TLS (such as GMail).