A Web Service for sending emails

The objetive of the webservice is to send a mail from an specific source email to a destiny mail one, using a template for the mail's body. The webservice should have a method Send, which will be in charge of sending the message based on an html template, this template will be stored in a table TMFORMATOMAIL, this templates table hast to be created with the following columns. CEFORMATO (integer) DEMDESCRIPCION (varchar 2000) BEMESTADO (integer) The parameter of the Send method is: Request Json: message { "header": [ { "Subject": "An email" }, { "From": "[login to view URL]" }, { "To": "[login to view URL]" }, { "Reply-to": "[login to view URL]" } ], "body": { "template": "1", "text": "Hello, Nice to meet you" } } The reponses are: Response JSON { "email": "[login to view URL]", "status": "sent", "reject_reason": "hard-bounce", } Error Response JSON { "status": "error", "code": 12, "name": "Unknown_account", "message": "No account exists with the id ‘123’" } The SMTP Server configuration will be obtained from a table. The implementation should use spring boot and spring data, consider use cache memory for to get better performance.