Is it okay to block competitors’ emails if client didn’t request it?

Posted by JayBowls@reddit | sysadmin | View on Reddit | 169 comments

A client submitted a ticket saying they’re no longer receiving emails from an expected sender. Upon investigation it was determined to be caused by an inbound filter policy in the spam filter quarantining emails from a certain domain. I recognize the domain as a competitor’s domain. I believe this policy was created by a manager feeling slighted after losing a client to this competitor already and but this block in place to prevent it from happening again. My question is, is this super shady practice common, unethical, morally reprehensible, but ultimately legal? Or is this considered “tortious interference”, an unfair/deceptive trade practice, a breach of contract/duty, a violation of privacy or communications law, and above all illegal? My second question, which might be for a different subreddit, is, if they terminate my employment for disclosing the conclusion to the client/competitor (in an “at-will” state in the United States), would I have any ground to stand on in a wrongful termination suit as a whistleblower?