Lew Ayotte

The Pigeon Pack plugin is completely free! This plugin aims to solve one problem, putting the power of email marketing, newsletters, and campaigns in the hands of YOU. Now you do not need to pay for a third party like MailChimp or Constant Contact to reach out to your customers. You have full control and power over your own lists and you can bring them anywhere at any time. The Pigeon Pack plugin is GPL and free to use on any WordPress website.
Features of this plugin include:
<ul>
<li>Single Email Campaigns</li>
<li>WordPress Post Campaigns (single or digest)</li>
<li>Email a specific role or create a list</li>
<li>Easy to use shortcodes and widgets for users to sign up for your emails from your website</li>
<li>Create custom fields for your lists</li>
<li>Double Opt-in available for lists</li>
<li>Easily extendable with filters and action hooks</li>
</ul>
You can follow the development of this plugin at <a href="https://github.com/PigeonPack/PigeonPack" rel="nofollow ugc">GitHub</a>!
Premium Pigeon Pack Add-ons (COMING SOON):
<ul>
<li>Analytics – Learn more about what your subscribers are doing!</li>
<li>Autoresponders (Events) – Send a series of messages to new subscribers.</li>
<li>RSS Campaigns – Import the RSS feed from another site to send to your subscribers.</li>
<li>Import Scripts – Import subscribers from other lists using CSV, MailChimp, Salesforce, Highrise, Constant Contact and more!</li>
<li>Bounce Detector – Use the power of the Pigeon Pack servers to detect when a subscriber’s email is bounced to help reduce the chances of your server being flagged as SPAM.</li>
<li>Responsive Email Template – No more plain-jane emails!</li>
<li>Notifications – Receive notifications whenever someone subscribers or unsubscribers from your list.</li>
<li>Amazon SES – Built-in functionality to work directly with the Amazon Simple Email Server service.</li>
</ul>
Please visit the Pigeon Pack website for access to <a href="http://pigeonpack.com/" rel="nofollow ugc">support and premium membership add-ons</a>!
<h3>License</h3>
Pigeon Pack 
Copyright (C) 2013 leenk.me, LLC.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Pigeon Pack

Free and easy email marketing, newsletters, and campaigns; built into your WordPress dashboard!

Bernhard Kau

To be able to use the plugin, you have to get API credentials from Mailchimp. You can find them in the <a href="https://us1.admin.mailchimp.com/account/api/" rel="nofollow ugc">API keys section</a> of your Mailchimp account. If you already use the plugin “Mailchimp” or “Mailchimp for WooCommerce”, the API key from these will automatically be used.
The plugin allows you to show all campaigns from the connected Mailchimp account. You can show up to 100 campaigns (this is a hard limit of the Mailchimp marketing API). For each campaign, you can either show the “Title” or the “Subject”. You can also show the author/sender as well as the sending date (and time).
This is not an official Mailchimp plugin. Mailchimp® is <a href="https://mailchimp.com/legal/copyright/" rel="nofollow ugc">a registered trademark</a> of The Rocket Science Group.

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Adds a block to show an archive for Mailchimp campaigns.

Pigeon Pack vs Campaign Archive Block for Mailchimp