How To Distinguish Emails Between Real Zix Message Center And Phishing?

Regarding how to figure out if the mails are real from the zixmessagecenter - These days it's simple to create a phake email claiming to be from zixcorp with buried links to third party websites that have malware payloads waiting to be accessed and deployed. It's stunning to me that there are companies still using a supposedly secure message system that can be so easily compromised.

But I'm sad to report that it is. My own bank is apparently sending out secure communications via ZixCorp in the form of a crude form letter with links that the user apparently has to click in order to receive the "secure message" from their bank. Amazingly these emails don't even have a digital signature! So, anyone who wants to get access to a huge treasure trove of usernames and passwords just has to craft a form letter email that claims to have secure messages for the reader with a bit fat button that ostensibly claims to be a link to zixcorp and spam it out to the world. There ya go, job done. Tsk tsk tsk and shame on any financial institution relying on such a flimsy service.