Both Template Designer 2 and Mailing Designer 2 use some behind-the-scenes logic to make sure that your hyperlinks actually go somewhere. The validation checks the hyperlink format and destination (i.e., does the web page exist). Valid URLs meet both criteria.
Valid URLs follow the format below:
<protocol>://<domain name>.<top level domain name>
For example, http://www.higherlogic.com is a valid URL.
If you enter an invalid URL, Marketing Automation Professional (MA Professional) displays an error message.
While hyperlink validation is definitively a behind-the-scenes activity, the underlying concept is pretty simple. MA Professional first sends a network request to the hyperlink. If it receives a success code (200, 300, etc.), the hyperlink passes validation. If it receives a different response (e.g., a 404 error), the hyperlink does not pass.
Keep in mind that the validation test is not always sure-fire way to determine if the destination address exists and truly works! For example, MA Professional typically cannot validate hyperlinks to your organization's intranet site because external network requests are usually blocked.
If you need to insert a hyperlink that MA Professional cannot validate, check the Allow Insert checkbox below the URL. When you click Insert Hyperlink, MA Professional bypasses the validation and adds the hyperlink to your template or mailing.