Mail Delivery Failure

[Mail Delivery System]

This is the mail delivery agent at Symantec Email Security.cloud.

I was unable to deliver your message to the following addresses:

2429480438 at qq.com

Reason: 550 Ip frequency limited [MF/fLNxq+kqrdFv1P34TwHKQYWGK8FjFVsP7sdhV7K5N77tEddJ8nm00MALLJL8gKA== Blocked IP 67.219.250.113]. http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000725

The message subject was: 约蜜
The message date was: Fri, 13 Nov 2020 15:14:47 +0800
The message identifier was: AD/C1-28581-0723EAF5
The message reference was: server-17.tower-352.messagelabs.com!1605251670!20599!1

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