tech(mail_checker): rescue Mail::Field::IncompleteParseError

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.02%. Comparing base (06b8194) to head (d1e983e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10526 +/- ## ======================================= Coverage 81.02% 81.02% ======================================= Files 1220 1220 Lines 25844 25845 +1 Branches 4667 4667 ======================================= + Hits 20939 20940 +1 Misses 4905 4905 ```

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