How To Stop This Zoho Vault Email Spam???

I am suddenly receiving emails from Zoho Vault that I absolutely do not want or use. This suddenly started recently out of the blue and never happened before.

How can I turn this email off? I do not use Zoho Vault and have never used it.

This is what these emails state:

This email contains an encrypted copy of your passwords in Zoho Vault. This copy is as secure as the online version. You can access it with your master password.