I run marketing email databases. This is cute, but it doesn't actually do anything in most systems - either the employees all already get the marketing emails or there is a system-wide rule to suppress against the email domain. If you actually want to (potentially) break something, try submitting some obscure characters or malformed html into some fields. Blank spaces in emails can particularly be a nuisance. And if…
The extended version where he sends signs up his list of other spammers for each other's newsletters should get around that problem.
There's a product we use called SiftRock that automatically sorts through noisy inboxes and detects real human responses so we know which ones a service person actually needs to respond to.