Email provider
QQ SMTP Error Codes and Bounce Messages
QQ Mail is Tencent's mail service in China. Delivery from senders and servers outside China can be unpredictable, so registering the Return-Path domain with QQ's postmaster site is the best way to get visibility.
- Codes on record
- 2
- Responses
- 8
Postmaster & documentation
SMTP 5011 response
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 501 across every provider
SMTP 5507 responses
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
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 550 across every provider
QQ bounce questions
›Why is QQ bouncing my email?
QQ Mail is Tencent's mail service in China. Delivery from senders and servers outside China can be unpredictable, so registering the Return-Path domain with QQ's postmaster site is the best way to get visibility. Match the exact wording of your bounce to one of the 8 responses on this page to find the specific reason and fix.
›How do I improve deliverability to QQ?
Authenticate with SPF, DKIM and DMARC, keep your sending IP and domain reputation clean, mail only engaged recipients, and honour unsubscribes. QQ also publishes postmaster guidance, linked on this page.
