Suddenly, the Inbox was showered with letters kind of Mail Delivery System with a field of view of the Sender ***@мойсайт.net
On the website connected Gmail from Google Apps free package. In the list of existing mailboxes @мойсайт.net boxes *** do not watch.
Passwords to all existing users of the mail @мойсайт.net changed.
Did not like it.
Tell me where to look, what actions to take? Thank you!