Merge branch 'hotfix/3.0.8.2'
Merge branch 'release/3.2.0.1'
Merge branch 'release/3.2.0.2'
Merge branch 'release/3.2.0.3'
Merge branch 'release/3.2.0.4'
Merge branch 'release/3.2.0.5'
Merge branch 'release/3.2.0.6'
Fix multipart email rendering #6378

* Refactored mail construction for different cases
* Added tests to verify the constructed email.message
Released version 3.0.2.7
Merge branch 'hotfix/3.2.0.7' into develop