[Mailman-Users] "mailing list probe message"

[Lee Underwood]

Apologies if this problem has been dealt with before but I am unable to find an answer anywhere in the archives.

I received an e-mail from a subscriber with the following message that he had received from our mailing list (sent by the list automatically). The message said, in part:

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This is a probe message.  You can ignore this message.

The Tmflist mailing list has received a number of bounces from you, indicating that there may be a problem delivering messages to knutsons at new.rr.com. A bounce sample is attached below.  Please examine this message to make sure there are no problems with your email address.  You may want to check with your mail administrator for more help.

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I have never seen this before and, since our mailing list was set-up by the Web host, I'm not familiar with the set-up. I did see something about a probe in the archives but it was talking about something else. I'm concerned because the letter to the subscriber also contained his password, along with 121 other subscriber's e-mail addresses (the mailing list is over 8,000 subscribers).

Any help would be appreciated. What is it that I am supposed to do to stop these e-mails being sent with the other addresses. (The list is a bit "sensitive" as far as who the subscribers are.) Thanks!

Lee