Steady stream of probe email messages.

[David Kovar <dkovar () gmail com>]

Good evening,

A mid-sized high tech client got a new CEO a few months ago. Since coming on board, he's received a steady stream of 
probe email addresses from a wide variety of throw away email address. The addresses are most often Gmail accounts with 
random letters for the name and for the address. The subject line and message body are often blank, but they 
occasionally contain "Hello". There is no malicious payload. No other messages arrive from the same address to any 
employee and the sender's address doesn't show up via any searches I've conducted.

Any speculation on the purpose of these messages?
Any ideas on how to trace them back to someone?
Any ideas on how to stop them?
Anyone else seeing this?

-David
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