How to add a link into your message
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Important
You should avoid linking to URLs containing folders with 1-2 characters (such as domain.com/e/something/ or domain.com/es/) as some filters may consider it as a negative item.
Your links should be full links to the real URL or you can use shortened links from URL shortening services such as https://goo.gl/
In the HTML Message the pictures can be displayed and the link to the picture should be complete ( with the http:// ...)