No, I didn’t send the spam…
So how did you get a spam message appearing to be from someone @arfunk.com or @AndyFunk.org?
Unethical businesses send out messages with forged return addresses that appear to have been sent by innocent third parties. It’s unfortunately fairly easy to do this — see this Federal Trade Commission (FTC) report. Both the message recipient and the domain that has been forged are victimized — in this case you and me.
The FTC suggests steps to stop unwanted phone calls and text messages.
Thank you for your understanding, and my sympathies for any inconvenience this may have caused you.