I'd like to have a text field in a portlet on the news page where visitors can leave their email address. When I create a news item, a news article should be sent to the subscribers including a link where they can unsubscribe from the news letter.
I had some problems installing EasyNewsletter on Plone 5.0.8.
I got this error when I tried to upgrade plone.protect to the latest version (3.1.3):
Using unpack_wheel() shim over the deprecated wheel_to_egg() hook.
Please update your wheel extension implementation for one that installs a .whl
handler in zc.buildout.easy_install.UNPACKERS