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This plugin imports forms from you PhpList host into wordpress. 
Your subscription forms can be used anywhere in wordpress using shortcodes. 
Custom user attributes defined in phplist are also taken into account. 
The plugin uses async calls (ajax) for registrations. You can fully customize the respone on success or failures.
NOTE: This plugin will only work with self hosted PhpList environments. It does not work with phplist.com accounts.
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PhpList Subber

Integrate your PhpList subscription forms in Wordpress, including user attributes in phpList.

Paul Newman

WebJunk PHPList brings PHPlist – to the WordPress world. 
This plugin allows you to use a seperate installation of PHPList. This allows you to use PHPList with any other web application or even directly on the Internet. As a seperate install You can upgrade or reinstall WordPress with it never affecting PHPList. The version of PHPList is also not tied to a plugin. If needed you can move PHPList. 
WebJunk PHPList displays the actual configurable subscriber page from PHPList so you are not limited to text only fields. Anything used in PHPList directly will work within WordPress with this plugin. 
Since PHPList is not dependant on WordPress at all, you can safely assign other administrators without having to assin them any privledges in WordPress.
phplist is the world’s most popular open source email manager
<h3>Other</h3>
Fixes applied in PHPlists: 
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WebJunk PHPList

WebJunk PHPList is a Wordpress plugin that integrates a Seperate PHPList install with Wordpress.

PhpList Subber vs WebJunk PHPList