Legit business traffic is getting past anvil, and jumped up normally after 08:00:
Per-Hour Traffic Summary
time received delivered deferred bounced rejected
--------------------------------------------------------------------
0000-0100 548 496 7 10 8669
0100-0200 455 465 10 8 9094
0200-0300 451 407 4 4 8210
0300-0400 465 388 13 5 9772
0400-0500 390 320 12 3 7842
0500-0600 457 404 17 8 8110
0600-0700 531 532 23 6 8142
0700-0800 636 663 5 4 8973
0800-0900 1052 982 5 4 9962
1000-1100 0 0 0 0 0
Len
