LogFAQs > #980204803

Hover over the "From" address in the spam email. Odds are it's actually from a different address, spoofed to look like yours. Spam emails will often be made to look like they're from somebody else, in this case spoofing the recipient's address for the sake of freaking them out. In that case, delete it and move on.

If it's actually from your account (unlikely, but not impossible), it's been compromised and you should change your password. Make sure you run a virus/malware scan on your computer first to ensure the password change isn't picked up by anything that might be lurking there, then change your password and force a logout for all devices.