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What could be triggering this - 'URI: "Try it" URI, suspicious hostname'?

Official response from

It sounds like you're referring to a spam testing platform's error for one of your email blasts. If that's correct, this error typically signifies that there is a URL (image, website link, etc.) in your email content that may be viewed as potential spam by a recipient's ISP. 

If you would like us to take a look at a specific email blast, please send a link to your email, the error message in question, and the source of the error message to

Complete and current information on how to use NationBuilder is available in the documentation section.

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