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What does this mean


 

I checked the history of a brand new member and this is what appeared for the test message I posted to him:
MessageNew Statler Siblings Test message for new member DavidAttempted2:54pmResponse550 5.1.0 <66.175.222.12> This IP has sent too many messages this hour. IB504 <http://x.co/rlbounce>I don't understand the too many messages this hour part--is that related to his provider or something on Groups.io's end?ThanksJanice?B

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