I also got spamed on 2018-06-05 with an email address "kirstiea.lucey464911@cz.mexyst.com"
No adress spoofing involved.

On 2018 m. birželio 9 d. 11:07:00 GMT+03:00, nusenu <nusenu-lists@riseup.net> wrote:
I also got spam as an off-list reply after sending an email to this 
list (starting with 2018-06-05) but there is no spoofing involved and the from is
"kirstiea.lucey536805@fk.mexyst.com"

which made it easy to simply filter/delete emails from that address
without causing any further annoyance until they change the address.


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Sent from my Android device with K-9 Mail. Please excuse my brevity.