Occasionally I get members who claim they are getting duplicate messages and
there is no obvious problem.  Frequently it occurs with a large ISP,
ESPECIALLY AOL.  Does anyone else have similar problems?  I'm thinking that
it's probably due to the fact that since I have so many AOL users, and that
messages for the same site are bundled into one message for many recipients,
that if in the process the connection breaks, when it restarts it will end up
sending the message again to the users who were sent the message before it
broke.  Is there any other explanation?  Also, one of our users gave us the
following explanation, and I would like someone's opinion on whether there is
an validity to it (because I've never heard of it).  Thanks.

Mark

> When the list sends email to all of the subscribers, it sends an
> individual email to each subscriber. The originating server creates a
> unique "tag" and attaches it to the message, then sends it to at least
> 3 different relay servers on the Internet. The three copies of this
> message then bounce across the Internet toward the destination server
> at your ISP. When the first one arrives, it is compared against the
> tags of the other messages in your box, then stored. When the other
> copies of the message arrive, they are compared also. When they match
> the tag on the copy already stored, they are not stored (because they
> are duplicates).