• Mailchimp sends your campaign only if your feeds are validating. They do not tell you this in any clear way. The campaign says sending, even though it is not.

    Make sure you validate your feeds!

    This plugin adds height=”auto” which is not allowed in the new HTML5 feed validator: https://validator.w3.org/feed/

    Height need to be a positive integer.

    I changed height and width to my featured image size 675 px and 12000px on line 48 in the plugin’s php file.

    Now it validates.

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