If you get an email that appears to be from Mojang Support, make sure to check it for validity before sending any personal info. Legitimate support emails from us will come from the email addresses firstname.lastname@example.org or email@example.com. We do not ask for information using forms and we will NEVER ask you for your password.
In the following fake email, you can see that the email is not sent from firstname.lastname@example.org and that it asks for your personal/login information.
If you receive an email and you're not sure it's from us, DO NOT RESPOND! We will never ask you for account information outside our regular support channels, and we will never ask you for it if you haven't contacted us first.
If you still need assistance or are not sure if an email was from us, please contact Minecraft support.