Fix. Code. Protects against PTR spoofing

[AntonV1211]

https://app.doboard.com/1/task/41742

[codecov]

Codecov Report

❌ Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 10.06%. Comparing base (ef029fe) to head (0bc0ffe).
⚠️ Report is 5 commits behind head on dev.

Files with missing lines	Patch %	Lines
lib/Cleantalk/Common/Helper.php	0.00%	11 Missing ⚠️
lib/Cleantalk/ApbctWP/RemoteCalls.php	0.00%	4 Missing ⚠️
inc/cleantalk-public-integrations.php	0.00%	3 Missing ⚠️
lib/Cleantalk/Antispam/Cleantalk.php	0.00%	2 Missing ⚠️
lib/Cleantalk/Common/DNS.php	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##               dev     #733      +/-   ##
===========================================
+ Coverage     9.90%   10.06%   +0.16%     
- Complexity    5194     5205      +11     
===========================================
  Files          252      252              
  Lines        26805    26824      +19     
===========================================
+ Hits          2655     2701      +46     
+ Misses       24150    24123      -27     

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