About this question
I received an email that purports to contain a "zix secure email" message. It directed me to a page http://zixmessagecenter.com/s/e where I can add my email & password.
I did some research and it seems that zix is a legit company providing secure email, but I have no way to distinguish between what their real sites are and what is phishing. And "zixmessagecenter.com" certainly isn't "zixcorp.com" so I'm not sure that this is really their web site, or some rogue domain that has the artwork of some legit zix pages downloaded and put into their page. So how do I tell if this is phishing or not?