Not many days passed till passwords from “yandex mail” were hacked and leaked online, today seems that even google with its security missed something and about 5.000.000 gmail accounts and passwords were hacked and they now are available on internet. So this means that if your mail is in that list anyone can log into it.
If you think that your mail account was no leaked, don’t keep it calm, right now change your passwords, add more that 8 characters, password should be hard. Else you can try a password generator, go to following link:
Next you can check if your password was leaked by going to following link and writing your email address:
Remember you should change your password very often and you should memorize your password.