I don't if this is because my account has been hacked or what but I am being bombarded with thousands of emails asking me to confirm my subscription to a mailing list. They all have the following format:

We have received a request from "(IP address)" for subscription of your email address, "(my email address)", to the "some random name" mailing list.

I've run every antivirus/malware on my computer (avast, windows defender and spybot S&D) but they've all found nothing and i've changed my password 3 times but it's still happening, rendering my email unusable.

Please help!!