Do you Use an Enterprise Mail Sink?
Sometimes also called a "junk mail account", these accounts are usually created through free email services like Hotmail or Yahoo. Mail sinks are great tools for when you need to provide an email address to obtain something from the Internet, but don't want to give out your personal account for fear of getting on a SPAM or Malware distribution list.
I see this behavior happening a lot with personal email accounts, but I'll admit that I haven't seen it happen much in corporate environments. Let's think about the solution a little...
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The solution I'm thinking of can be excessively simple. First, set up a mail sink for each of your users. This can be either one individual junk mail account per user or even one generic one for all users.
Then, configure your external mail filter or mail server to automatically reject those addresses. By doing this, when users go to those quasi-legitimate web sites (which they still do even when you train them not to) and put in an email address (also a behavior you train them not to, yet they still do), they're at least not providing a listening email account.
By doing this, you're providing a service to your users while at the same time reducing the overall potential for junk mail getting into your internal network.
Do you provide managed mail sinks for your users? Are there other solutions for providing this service in an enterprise? Let us know...
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