Some email services block the box just because of the fact that the user for some time does not use it (e.g., several years). As a rule, in this case, log in to the mail box without too much difficulty. Ie will need to click "unblock", and then freely log in using your username and password.
If the mail box is locked due to the removal (usually the block lasts for several months, and then removed), then restore it difficult. You just need to click "unlock" and enter either the answer to the secret question, written at check boxa or mobile number is also specified during registration.
Sometimes the message about blocking the mail boxbut is a page – disguise. And the hacker. Usually it says that you need to unlock: send SMS to so-and-so" or something like that. To get rid of such errors is necessary as follows. First of all, find the hosts file, which is located at the Drive where the operating system is – Windows - System32 - Drivers – Etc. The hosts file need to remove and restart the computer, after which such lock message should disappear.
When not needed no SMS, and it is written directly that the mail box is locked, for example, for spamming. And not even offered any alternatives to unlock, then you need to scan your computer for viruses. And a good antivirus (e.g. Kaspersky Internet Security). You need to go to the link and click on "verify". Opposite to the notices, written in red, you will need to visit the links and make a request to have your ip removed from the spam database. After the operations, write to technical support of the postal service with a request to unlock your drawer. When you get access to mail – be sure to change the password.