Undelivered Mail Returned to Sender

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<2576732703 at qq.com>: host mx3.qq.com[203.205.219.57] said: 550 Ip frequency
    limited [NWN4CLd480wPnyZNcBl0BkknasUht6wAixEm5flx2zt1t4CqqfSXzOo= Blocked
    IP 192.255.235.115].
    http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000725 (in
    reply to end of DATA command)
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