Sumada Kaabaha: sendmail
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SAR Friendly SMTP
A friendly SMTP plugin for WordPress. No third-party, simply using WordPress native possibilities.
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Wp Hard Mailer
Create two textareas, one for create a form template and other for a mail template. The form can be putted in posts, pages or sidebars.
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SendCloud
The SendCloud allows you to send email to your subscribers if your blog has updates. you can monitor the sending email data from data center