I tried posting this to the list two days ago, but it hasn't appeared... My SysAdmin has now contacted Tulsa. We're still waiting for a reply. Sorry for the inconvenience.
I apologize to the list members. This is the second such mysterious message, and the fact is I haven't a clue what is causing it. I have alerted both my systems administrator and the math-teach listowner.
Please note, my e-mail address is rfouchaux@EDU.YorkU.CA, (the capitalization is relevant) and my mailserver is sungod.ccs.yorku.ca, York University, Ontario, Canada. The mysterious messages originate at VM.TULSA.CC.OK.US, which I assume is Tulsa, Oklahoma, and are from "rfouchaux@Edu.Yorku.CA" (subtle difference in capitalization).
I will refrain from posting to the list until this problem can be sorted out. Thanks in advance for your understanding. I suppose this posting will generate yet a third such message, unless the problem has fixed itself.