refactor: adjust mail ingestion api

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.93%. Comparing base (187c2c5) to head (5c99fbc).
Report is 241 commits behind head on main.

❗ Current head 5c99fbc differs from pull request most recent head bf07e28

Please upload reports for the commit bf07e28 to get more accurate results.

Files	Patch %	Lines
ietf/api/views.py	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7523      +/-   ##
==========================================
- Coverage   88.98%   88.93%   -0.06%     
==========================================
  Files         291      295       +4     
  Lines       40717    41242     +525     
==========================================
+ Hits        36233    36679     +446     
- Misses       4484     4563      +79     

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