This is the unfortunate result of the “every growing uphill battle with SPAM”, but apparently an email to me from Anders Jacobsen was rejected due to some of the drastic, but efficient, measures John has been applying to the server.
Anders brings up some interesting points, in that the automated rejection notices, from legitimate senders, present themselves as bad-mannered netiquette that penetrates the social fabric of the online world.
As I said in my response to Anders, “SPAM has effectively transformed an efficient means of communication into a bastion of nonsense.”