OK Emily, I got the sample email (though I should mention it was in my hosted spam provider's quarantine).
Anyway, the URL to go.wennsoft.com does have an http:// in front of it (which is good, otherwise it wouldn't work) and it functions well for me.
However, I looked a little deeper to see why other leads might not be able to find the domain when they click. I noted that the DNS servers for wennsoft.com are also open recursive servers. If you're familiar with the idea of an "open proxy" for web browser use, this is basically the equivalent for DNS traffic. It means anyone can send requests to your DNS servers for any domain (as opposed to only for wennsoft.com). You should really, really have your IT staff look into this, because (a) it presents a security vulnerability in that a malicious attacker could potentially make your DNS server send falsified records for go.wennsoft.com (or www.wennsoft.com, too), using a method called DNS cache poisoning; and (b) perhaps more important, it creates the appearance of impropriety because open DNS servers are more likely to be used by spammers, scammers, or simply non-professional organizations.
I'm not saying conclusively that open DNS servers are the direct cause of your current issue -- but since you're looking for answers, I can't ignore the fact that your DNS setup is easily picked out as broken. You need to eliminate this possible factor as soon as possible.
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