Attempted to fake being google. Failed PTR lookup:

Hi all
I see too many Attempted to fake being google. Failed PTR lookup:

in error tab.

how can i fix this?

here is my error log file:

2020-06-27 19:08:04.991580 [NOTICE] [1181] [108.162.238.8] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:08:26.366024 [NOTICE] [1181] [162.158.186.203] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:08:34.447788 [NOTICE] [1181] [162.158.187.244] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:09:21.475206 [NOTICE] [1181] [162.158.186.113] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:09:42.000616 [NOTICE] [1181] [162.158.187.212] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:09:45.131231 [NOTICE] [1181] [108.162.237.217] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:11:15.755310 [NOTICE] [1181] [162.158.187.12] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:16:57.598866 [NOTICE] [1181] [162.158.187.74] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:18:01.690719 [NOTICE] [1181] [162.158.186.173] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:18:05.035436 [NOTICE] [1181] [162.158.187.166] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:19:46.402977 [NOTICE] [1181] [162.158.187.76] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:24:46.513588 [NOTICE] [1181] [162.158.186.131] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:25:07.937393 [NOTICE] [1181] [162.158.187.88] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:25:08.083275 [NOTICE] [1181] [162.158.187.130] Attempted to fake being google. Failed PTR lookup:
2020-06-27 19:25:08.956272 [NOTICE] [1181] [162.158.187.180] Attempted to fake being google. Failed PTR lookup:

thanks for your answer! I solved ptr record from digitalocean and i check my ptr records with this tool → Reverse IP Lookup - MxToolbox everythink looks fine

but still get same error.