{
    "MailTo": "abcdefg@hijklmn.opqrst",
    "Subject": "This is the subject",
    "Body": "This is the body"
}

[HttpPost]
public IHttpActionResult SendMail([FromBody] MailData mailData)
    {
        if(ValidateMailData(mailData) == true)
        {
             Email.send(mailData);
             return Ok("Your email was sent!");
        }

        return BadRequest("Some error");
    }