163 The mailbox cannot receive the verification code. What happened?

Network problem, mailbox setting problem, mailbox full, etc.

1, 163 The failure to receive the verification code in the mailbox is a network problem, and the network instability or delay causes the verification code not to be received normally.

2. Check the mailbox settings to ensure that the verification code email will not be misjudged as spam or intercepted.

3. The mailbox capacity is full, so it can't receive new mail normally. You can clean up the mailbox space or contact the mailbox service provider to increase the mailbox capacity.