QQ / SMTP error code 550
smtp;550 Sender frequency limited. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000723
The sender 's sending frequency exceeded the limit. The amount of time that further mail is prohibited from being delivered depends on the limit exceeded. (for example, sender, hourly, daily). These limits are not disclosed.
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