An email has been received that contains a link that has not been rewritten by the Click-time URL Protection service.
Or
An email has been received that contains a link that points to a URL that begins with https://clicktime.symantec.com/ . Upon clicking the link, you are directed to a site that you believe is hosting dangerous or malicious content, but you were not presented with a block page.
Check your Click-time URL Protection service settings in the https://clients.messagelabs.com/ portal.
Submit false negative spam emails missed by Symantec.cloud email services