Does this look like slave computers making spam were run through my domain email accounts?

I noticed a stream of peculiar emails coming through when I finally unraveled my misdirected domain email and started getting my mail. Tons of messages from innocuous addresses all strange to me with a 3–6 character code in the subject and and a 1–3 character code in the body. Are these slave computers reporting in? and is this peculiar threat/offer to possess my domain some kind of a response to my blocking my generic email addresses and slowing this junk down to a trickle which somehow manages to use my remaining two addresses.

I also seem to be in the odd position of receiving spam from myself as SoAndSo@anartist.com. as well as tons of other spam.
Am I looking at slaves and a spam king?

Just curious