Why can't qq mailbox receive verification code?

Spam filtering: Sometimes, the verification code mail may be misjudged as spam, so check the spam folder first.

Mailbox full: If your mailbox has exceeded the capacity limit, you may not be able to receive new mail. Clean up the mailbox and free up space.

Mailbox Settings: Check the filtering settings of mailboxes to ensure that important messages are not put into other folders.

Sender's problem: Due to the sender's problem, some verification code messages may be delayed or blocked. You can try sending the verification code with a different sender.

Network delay: sometimes network problems may cause mail to be late.

Email blacklist: If you have marked the email that sent the verification code as spam or added it to the blacklist, you may not be able to receive the email from it.

Mailbox is locked: If your mailbox is locked or there is a security problem, you may not be able to receive mail. You can try to log in to the mailbox to see if there are any relevant tips.

Verification code has expired: Some verification codes have a limited validity period. If your mailbox is delayed, the verification code may expire.

If you still can't solve the problem after trying the above methods, I suggest you contact the customer service support of QQ mailbox, who can help you further investigate the problem and provide solutions.