I think it is law in most states that a communication is deemed served when it is posted in the U.S. Mail.  I do not think email has the same legal notice.  Personal notes are definitely the way to go to thank.  A written cease & desist letter to the offenders should be send registered mail, return receipt requested.  This puts them on notice that there is a problem and gives them a chance to respond.  Usually a good piece of evidence to file with a legal complaint.

 

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