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# Description of Changes Please provide a summary of the changes, including: - **What was changed** - **EmailController**: Added a `catch (MailSendException)` block to handle invalid-address errors, log the exception, and return a 500 response with the raw error message. - **EmailServiceTest**: Added unit tests for attachment-related error cases (missing filename, null filename, missing file, null file) and invalid “to” address (null or empty), expecting `MessagingException` or `MailSendException`. - **MailConfigTest**: New test class verifying `MailConfig.java` correctly initializes `JavaMailSenderImpl` with host, port, username, password, default encoding, and SMTP properties. - **EmailControllerTest**: Refactored into a parameterized test (`shouldHandleEmailRequests`) covering four scenarios: success, generic messaging error, missing `to` parameter, and invalid address formatting. - **Why the change was made** - To ensure invalid email addresses and missing attachments are handled gracefully at the controller layer, providing clearer feedback to API clients. - To improve overall test coverage and guard against regressions in email functionality. - To enforce correct mail configuration via automated tests. --- ## Checklist ### General - [x] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [x] I have read the [Stirling-PDF Developer Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md) (if applicable) - [ ] I have read the [How to add new languages to Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md) (if applicable) - [x] I have performed a self-review of my own code - [x] My changes generate no new warnings ### Documentation - [ ] I have updated relevant docs on [Stirling-PDF's doc repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/) (if functionality has heavily changed) - [ ] I have read the section [Add New Translation Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags) (for new translation tags only) ### UI Changes (if applicable) - [ ] Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR) ### Testing (if applicable) - [ ] I have tested my changes locally. Refer to the [Testing Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing) for more details.