It likely means that they were sending and/or recieving too much mail.
If the client isn't intentionally sending mass mailings, like to a mailing list, its possible that they have been hacked into and are being used as a spam-bot. Does the client have Virus protection on their computer and a good firewall? If not, its possible, even likely that they are being used to send spam without them even knowing.
Good luck solving the problem, hopefully its something easily fixed.
Thanks - Brian
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Brian has it right on the dot. Your client's site is probably sending out huge mailing lists or sending/receiving a ton of e-mails. Or, it could be a combination of the both. You should ask your host for some more details, though.
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ok, so it seems like what's going on is spam bots are using his e-mail form to send him spam. this creates a lot of unwanted spam as well as returned/invalid/error e-mails in his account. when the form is disabled, these problems go away.
my question: what can be done to prevent spam bots from using the form?