Leniy

You can easily send subscription,notification,newsletter,etc by email to your comments users under one post. 
方便给某篇文章的评论用户发送订阅、通知等邮件。
DEMO:<a href="http://blog.leniy.org/mail-to-all.html" title="示例页面" rel="nofollow ugc">Leniy</a> 
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=HAENMLDR2UMFJ&lc=US&item_name=Leniy%20Plugins%20Donation&item_number=plugin%2ddonate&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donate_SM%2egif%3aNonHosted" rel="nofollow ugc">Donate link</a>

Mail To All

You can easily send subscription,notification,newsletter,etc by email to your comments users under one post.

Enormail E-mail Marketing

The official Enormail WordPress plugin makes it very easy to display your signup forms created in Enormail on your WordPress website.
Once you activated the plugin and connected your Enormail account you will be able to easily select and display any webform created in 
your Enormail account. You can place your webforms in any widget area through the Enormail widget or use it directly in your posts and 
webpages with the Enormail shortcode.
You will be up and running in no time and you just have to connect your Enormail account through the Enormail API.
Plugin features:
<ul>
<li>Add any webform created in your Enormail account to your WordPress blog or website</li>
<li>Contacts are automaticly saved to your Enormail account</li>
<li>Place webforms through widgets and shortcodes</li>
<li>Display popup, slide-in and embedded webforms</li>
<li>Setup once, and change all the settings in your Enormail account</li>
</ul>

Enormail Sign Up Forms

Add an Enormail signup form to your Wordpress website and start growing your list.

Mail To All vs Enormail Sign Up Forms