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.
8 responses across 2 reply codes
SMTP 501
1 responses
SMTP 550
7 responses
1
QQ rejected this under the recipient filter or personal blacklist. Contact the recipient another way if the mail is legitimate.
2
QQ temporarily blocked sends to this recipient after a flood of mail. Wait and retry later.
3
QQ says this mailbox was not found. Treat it as a hard bounce and remove the address.
4
QQ denied the message content as bulk spam. Rewrite the content and improve list quality before trying again.
5
QQ rate-limited this sender. Slow volume and wait out the window before sending again.
6
QQ flagged the domain or operator as a suspected spam source. Clean list quality and reputation before retrying.
7
QQ rejected this under DMARC. Align SPF or DKIM with the From domain so DMARC passes, then resend.
Response catalog adapted from the MIT-licensed SMTP Field Manual by ActiveCampaign / Postmark.