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You might have added their address to your whitelist, but what if the spam sender has spoofed (faked) e-mail address of your friend?

A fairly aggressive technique for spam filtering is what I would call the "whitelist plus automated verification" approach.

It's smart enough to import your address book into its whitelist, so messages from your existing correspondents will never be blocked.

If you are an expert at white listing bulk emails or simply know ways around getting into Inboxes of clients, please let me know.

And you can always check whitelist log to see blocked events and read deleted messages.

To limit any such exposure, a white list is in place and must explicitly list which URL patterns are permitted to be proxied in this manner.

You cannot consider blacklisting or whitelisting to be a foolproof solution.

The fundamentals of the white and blacklists used in spam filtering are very simple.

In other words, the most vulnerable apps are also apps whose vulnerabilities could be mitigated by a dose of application white listing.