install these
https://vborg.vbsupport.ru/showthread.php?t=248042
https://vborg.vbsupport.ru/showthread.php?t=261498
https://vborg.vbsupport.ru/showthread.php?t=268208
the last one is good as it will let you ban his host so does not matter if he changes his ip
the first one is good as i am sure he is on the spam list the 2nd one install if you wish but not really needed