38 registrations for variations on testing@example.comXXXXX

I woke up to paralegaldocuments.com having 38 new user registrations for for variations on testing@example.comXXXXX:

testing
testing@example.come5CDlBbv Customer 0
testing-0083 testing-0083
testing@example.com8qwIYaLCwaitfordelay0015 Customer 0
testing-0888 testing-0888
testing@example.comAND23868ANDCBHPCBHP Customer 0
testing-0995 testing-0995
testing@example.comAND23868ANDoAdRoAdR Customer 0
testing-1043 testing-1043
testing@example.comZvNCqYv2OR767SELECT767FROMPGSLEEP15 Customer 0
testing-1225 testing-1225
testing@example.comAND23868ANDrxeIrxeI Customer 0
testing-1547 testing-1547
testing@example.comAND23868ANDPm9mPm9m Customer 0
testing-1656 testing-1656
testing@example.comAND23868ANDXlgdXlgd Customer 0
testing-1766 testing-1766
testing@example.com4d45NB9zOR791SELECT791FROMPGSLEEP15 Customer 0
testing-1781 testing-1781
testing@example.com3Bm8HDKXOR900SELECT900FROMPGSLEEP15 Customer 0
testing-2082 testing-2082
testing@example.com19Mkwcbl Customer 0
testing-2183 testing-2183
testing@example.comAND23868ANDY4L4Y4L4 Customer 0
testing-2420 testing-2420
testing@example.com65iGTmdeOR37SELECT37FROMPGSLEEP15 Customer 0
testing-2495 testing-2495
testing@example.comAND23868ANDDsAPDsAP Customer 0
testing-2595 testing-2595
testing@example.comAND23868AND5bBG5bBG Customer 0
testing-2674 testing-2674
testing@example.comQ9ADzpKoOR396SELECT396FROMPGSLEEP15 Customer 0
testing-2885 testing-2885
testing@example.comN3GdPFfswaitfordelay0015 Customer 0
testing-3057 testing-3057
testing@example.comp2u6WAhXOR77SELECT77FROMPGSLEEP15 Customer 0
testing-3084 testing-3084
testing@example.comMQqZrJTtwaitfordelay0015 Customer 0
testing-3290 testing-3290
testing@example.comORItj0qWOR344SELECT344FROMPGSLEEP15 Customer 0

What setting or action is necessary to block these types of registrations? Thx.