nholdren

SayMore is a email opt-in plugin that adds users to an ExactTarget list using the web collect method once they comment on a post/page in your blog.

SayMore

An opt-in plugin for collecting email addresses of those who comment on your blog.

webworx.de

To use this plugin you need to register for the sitepackage:// newsletter system on http://www.sitepackage.de. There is a free version available.
sitepackage:// is a web based newsletter system to create, send and analyse personalized e-mailings and their spread across social media.
This plugin provides a fast and easy way to integrate a newsletter opt-in form into your website. The form consists of a title, an introductory text, an e-mail input field, a button and a privacy notice text. All texts and descriptions are editable. When setting up the form you also have to set your sitepackage:// project domain and form id. 
On submit the value of the e-mail input field, the project domain and the form id will be sent to an external sitepacke:// server to process the opt-in.

sitepackage:// Newsletter Opt-In

To use this plugin you need to register for the sitepackage:// newsletter system on http://www.sitepackage.de. There is a free version available.

SayMore vs sitepackage:// Newsletter Opt-In