On one of my lists 18 subscribers were deleted yesterday at the same time with no apparent reason. All the messages were in the format of:

"xxxxx@xxxxx.xxx has been removed from xxxxxx."

All addresses are aol, yahoo or hotmail/live. However other users with those accounts weren't removed For this group I have two lists. Some (but not all) belong to both lists but their subscriptions to the other list was not removed.

Any thoughts/suggestions?

Many thanks