It doesn't seem to be a host issue. I have a host with Layeredtech (dedicated server, not shared) and I still getting the same error email as OP about 100 every 5 mins. My managed server company can't seem to find out what's wrong.
Worst yet, I can't disable the email error. I disable error and handling in vboption, change email to different email in config.php. I even tried to close the forum and my old email is still keep getting error

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