mailing list messages

[tito]

Hi,
today I've got this message:

Your membership in the mailing list busybox has been disabled due to
excessive bounces The last bounce received from you was dated
22-Apr-2015.  You will not get any more messages from this list until
you re-enable your membership.  You will receive 2 more reminders like
this before your membership in the list is deleted.

and I wonder what bounces it is talking about?

Ciao,
Tito
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