Plug into possibility
Add new features or connect your favorite tools with thousands of plugins — available on all paid WordPress.com plans.
sendmail
3 extensions
SAR Friendly SMTPA friendly SMTP plugin for WordPress. No third-party, simply using WordPress native possibilities.
SendCloudThe SendCloud allows you to send email to your subscribers if your blog has updates. you can monitor the sending email data from data center
Wp Hard MailerCreate two textareas, one for create a form template and other for a mail template. The form can be putted in posts, pages or sidebars.