Rich Trott

We're experiencing something very similar with resolution emails. I've seen it both with resolution emails from our own Zendesk instance as well as a Zendesk instance form an external company from which I was getting support. We are using O365, so my suspicion is:

* It is something in the Zendesk default email. It does not have to do with customer modifications to the template.

* It is related to O365. People using other email clients are unlikely to see the problem. But O365 users aren't seeing the issue in anything other than Zendesk emails.

This article instructs the reader to enable CAPTCHA, but the doc it links to explains that CAPTCHA is enabled by default and can't be disabled.