Introduced tests for embedding files and managing attachments in messages. Validated behavior for setting and unsetting attachments and retrieving embedded files with various scenarios.
Introduce new EML files with valid and invalid examples. Implement tests for EML parsing from readers and files, checking for both successful parsing and expected failures on invalid inputs.
These files specify the copyright and licensing information for the logo assets. They ensure that our usage of these images complies with the CC-BY-ND-4.0 license.