1, the network is not connected well
Solution : Reconnect the network and make sure it is connected to the external network
2, network resolution problem
There is a problem with the network configuration and the server address of the mailbox cannot be resolved correctly.
Workaround : Refresh DNS or change the default DNS
3, browser issues
When we do not open the mailbox using the browser, it may be a browser setup problem
workaround : Change browser settings or reset browser settings
4, the mailbox was stolen
In the mailbox account is stolen, be changed login password, we also can not open the mailbox.
solution : According to the mailbox password does not remember the method to retrieve the mailbox password
5, Software problems
If we are using the QQ mailbox, and on the QQ click on the mailbox icon, can not be normal pop-up browser mailbox window, it is likely that the QQ client problems.
Solution : repair or reload QQ
6, Client issues
Sometimes we use foxmail or Express and other mailbox clients to send and receive mail, can not open the mailbox, it is likely the problem of software or mailbox configuration problems.
workaround : Upgrade or repair the client software, and reconfigure the mailbox.
7, System problems
Sometimes there are problems with the operating system and you cannot open mailboxes.
Solution : Repair or reload the system.