What does this MR do?
Fix an incorrect usage of a method to read the parts of an email message.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
It was adding an extra empty Mime section which was giving issues in some mail clients. You can see more information related to this here: https://productforums.google.com/forum/#!topic/gmail/aVoLmVuhV_c
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
Changelog entry added
API support added
Added for this feature/bug
All builds are passing
Conform by the merge request performance guides
Conform by the style guides
Branch has no merge conflicts with
master(if it does - rebase it please)
Squashed related commits together
What are the relevant issue numbers?
Closes #26463 (closed)