[Zope] kicked off list

[C]

Every so often, my other email address gets kicked off the zope list for
some reason. One day I'm receiving messages and the next day I'm not. After
this happened 3 times, I joined with a second address (this one) so I could
be sure it was a phenomenon with a single email address. Can anyone give me
a clue why this might be happening? I only occasionally send email to the
group, and I never cross-post.
Thanks!
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