tidingsco

This plugin lets you publish newsletters from your Tidings account to WordPress with the click of a button.
Install, activate, and go to the Tidings section of the Settings menu to configure the plugin.
Simply paste your Tidings Account Key, confirm the default category and author for each post, and you’re off to the races!
If desired, you can tailor the HTML tags used by each newsletter attribute. Styling is inherited (and customizable) via your theme’s CSS file.

Tidings

Publish your Tidings email newsletters to your Wordpress blog or website.

ubivox

Voxpress is the official plugin for integrating the Ubivox newsletter service with your wordpress site. Voxpress makes it possible to subscribe, unsubscribe and view archives of your newsletters.
<h4>Widgets</h4>
When Voxpress is installed you will get access to the following widgets:
<ul>
<li>Ubivox Subscription</li>
<li>Ubivox Unsubscription</li>
<li>Ubivox Archive</li>
<li>Ubivox Control Panel</li>
<li>Ubivox Verified Sender Seal</li>
</ul>
Widget: Subscription 
This widget will let you insert a subscription form into any of your widget areas. The widget can either be an inline widget but can also be a pop up widget.
The pop up widget will let you create a modal box when the page is loaded (or after a given delay) to prompt the visitor to subscribe. The modal box can be styled individual through the widget and you can have multiple subscription widgets on a page.
Widget: Unsubscription 
The unsubscribe widget will insert a form for unsubscribing a mail list on Ubivox. You can have multiple unsubscribe widgets on a page.
Widget: Archive 
The archive widget will show a list of links to the most recent archived newsletters on a selected list. The archived newsletters will open in a new window and show the newsletter archive view from Ubivox
Widget: Control Panel 
The control panel widget will provide a link to your Ubivox Subscriber control panel, where your subscribers can login and manage their subscriptions and data given to your.
Widget: Verified Sender Seal 
The verified sender widget will display your verified sender seal on your website.
<h4>Modal view of firect links to archived newsletters</h4>
When the plugin is activated you will be able to link to a raw version of an archived newsletter and it will be displayed in a modal popup, avoiding that your users leave your site.
<h4>Administrative features</h4>
You’ll also be able to view latest sent newsletters, drafts and statistics directly in you wordpress admin interface.
<h3>How to get an Ubivox account</h3>
Ubivox is a service for designing, writing, sending and evaluating newsletters. To use the Voxpress plugin you must have 
an Ubivox account to connect the plugin to.
You can sign up for an Ubivox account at <a href="https://www.ubivox.com" rel="nofollow ugc">https://www.ubivox.com</a>

Voxpress

Voxpress integrates your wordpress site with the Ubivox newsletter service. Subscribe, unsubscribe, archive lists and much more.

Tidings vs Voxpress