Update mailgun.js

[Mugunth140]

The code updates for the Mailgun email service focus on improving initialization, error handling, security, and overall maintainability. The Mailgun service is now initialized within the constructor of the MailgunService class, ensuring that API keys (key, domain, sender) are validated at the time of object creation, which prevents the application from running without the necessary credentials. Error handling has been enhanced by throwing specific errors for missing Mailgun keys and invalid email types, allowing for better debugging and more informative error messages.

Additionally, a null check has been implemented in the sendEmail method to handle cases where an invalid email type is provided, preventing attempts to send malformed emails. Logging has been improved to provide feedback on successful email dispatches, which aids in monitoring email activity and diagnosing issues. Security has also been prioritized by emphasizing the importance of securely storing API keys in environment variables, aligning with best practices for managing sensitive information in applications. Finally, the overall code has been refactored for better readability and maintainability, ensuring a clear structure and consistent error handling across the methods. Collectively, these updates enhance the robustness, security, and user experience of the Mailgun email service within the application.

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