Fix no mails exported v2

[marph91]

Resolves #31

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.58824% with 5 lines in your changes missing coverage. Please review.

Project coverage is 92.72%. Comparing base (86d2152) to head (16f9d4b).
Report is 12 commits behind head on master.

Files	Patch %	Lines
src/background.ts	70.58%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   93.61%   92.72%   -0.89%     
==========================================
  Files           2        2              
  Lines         188      220      +32     
  Branches       52       58       +6     
==========================================
+ Hits          176      204      +28     
- Misses         12       16       +4     

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