QQ

QQ is an instant messaging service that includes email, social groups and games, and online chat products, headquartered in China as part of Tencent. Email delivery can be unpredicatable for non-Chinese businesses or when sending through mailservers outside of China. For the most insight, register your Return-Path domain with QQ's Postmaster site to directly monitor delivery and respond to any spam complaints.

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501All 501 codes →

smtp;501 Bad address syntax. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000730

550All 550 codes →

smtp;550 Mail is rejected by recipients

smtp;550 Mailbox unavailable or access denied

smtp;550 Mailbox not found. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728

smtp;550 Mail content denied. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000726

smtp;550 Sender frequency limited. http://service.exmail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000723

smtp;550 Suspected spam sender.

High severity

smtp;550 DMARC check failed http://service.mail.qq.com/cgi-bin/help?subtype=1&&no=1001508&&id=16.

High severity

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