Add indimail samples 2024-06

[azumakuniyuki]

• reason filter #209
• Other Open Source MTAs #220
• https://github.com/indimail

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.55%. Comparing base (9119405) to head (052a8a8).

Additional details and impacted files

@@             Coverage Diff              @@
##           5-stable     #533      +/-   ##
============================================
+ Coverage     85.53%   85.55%   +0.01%     
============================================
  Files           135      135              
  Lines          6639     6639              
  Branches       1949     1949              
============================================
+ Hits           5679     5680       +1     
  Misses          307      307              
+ Partials        653      652       -1     

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