In this case, we advise you to contact our Support Department as fast as you can.
Our colleagues will ask you a couple of security questions and, if the information is confirmed, your compromised email address will be changed with a new one, indicated by you.
If you're experiencing this issue, please submit a ticket or send an email to support@heimdalsecurity.com if you are a Home user or to corpsupport@heimdalsecurity.com if you are an Enterprise client.