It looks like spammers are using fake email addresses at the toxicsoftware.com domain as a return address for their vile spam.
Toxicsoftware is not spamming you, we’re just as much a victim of this as the recipients of the spam. In fact the toxicsoftware catchall email account has received over 6000 bounced emails in the last hour. I’ll be turning off the catchall account temporarily until this spam-storm is over. You can reach me directly at jwight@toxicsoftware.com