The Webserver that these links lead to are unsafe and rated with high risk on Web Content.
Probably it has been seen on the Internet when spreading Malware or Spam and this is why Your mails are blocked because of a bad Trusted Source Reputation.
Please see http://www.mcafee.com/threat-intelligence/ip/default.aspx?ip=18.104.22.168 (22.214.171.124 is the IP of the mentioned Webserver)
You may contact Intel Security by using Threat Feedback to remedy you problem after your Webserver is clean again.
If it is not your Webserver, you may contact the owner.
Otherwise Your Customers have to Whitelist Your Adress in order not to be checked on Email- and/or Web-Reputation.
Great, looks like this works.
is only an example
True address for that service is 126.96.36.199 and looks like it does not have bad reputation.
So, why are we getting Potentially Unsafe URLs Detected errors?
as i said, You are getting these errors because one of the URLs on Your mail leads to potentially unsafe web content.
To get further information You need to ask Your customer for an excerpt from the Email Gateways conversation log from the affected Mail.
This tells You in detail which URLs are rated with bad reputation.
OK, I could find the offending links:
I checked them here and found that they were classified as High Risk:
Hopefully none of our Servers or services has been classified as risky, only these links that were part of a customer search.
Customer was pretending it was my company that was sending virus to them.