fix: handle error properly in sendEmail function

[Harmedino]

Description

This pull request fixes an issue in the sendEmail function where errors were not being handled properly. Previously, the function would return errors instead of throwing them, leading to unexpected behavior in error handling. This change modifies the error handling mechanism to throw errors instead of returning them directly, ensuring consistent and expected behavior throughout the application.

The motivation behind this change is to improve the robustness and reliability of the email sending functionality within the application. By throwing errors, the application can more effectively handle and respond to email sending failures, leading to a better user experience overall.

This fix addresses the following issue: [link to the related issue, if applicable]

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have read and understand the CONTRIBUTING.md document in this repository.
• I have added tests that prove my fix is effective or that my feature works
• Existing test suite passes locally with my changes
• I have made corresponding changes to the documentation