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.
After almost 2 years of developing a mailing solution (PHP mail class) that can be incorporated in virtually any existing script, http://www.xpertmailer.com is proud to present you the WordPress plugin of XPM4 (XpertMailer v4). Knowing the spread of WordPress and the adoption of it as the best blogging solution nowdays, we thought everyone needs a very versatile and highly configurable mail solution for WordPress. Therefore WP-XPM brings you ALOT of features designed to help you in your mailing quest. A quick overview of WP-XPM shows up some neat options that you can play with like: 5 methods of mail delivery ( you even knew there are so many?:) )
POP before SMTP, Mail Proxy method
Auto failback option to MX Zone delivery if the selected delivery method doesnt work