mail.cs

    public static class SendGridDeliveryServices
    {
       
        private static string _sendGridApiKey = "...";

        public static bool SendMailToCustomerServices(string name, string email, string subject, string body)
        {
        
            var from = new EmailAddress("system@xyz.com", name);
            var reply = new EmailAddress(email, name);
            var to = new EmailAddress("hello@xyz.com");
            
            var mail = new SendGridMessage()
            {
                From = from,
                Subject = subject,
                PlainTextContent = body,
            };

            mail.AddTo(to);

            mail.ReplyTo = reply;

            return PostMail(mail).Result;
        }

        public static async Task<bool> PostMail(SendGridMessage mail)
        {

            var client = new SendGridClient(_sendGridApiKey);
            var response = await client.SendEmailAsync(mail); // This line hang indefinitively

            //Success
            if (response.StatusCode == System.Net.HttpStatusCode.Accepted || response.StatusCode == System.Net.HttpStatusCode.OK)
                return true;

            //Error, get message to log it.
            
            // var responseBody = response.Body.ReadAsStringAsync().Result;
            // logger.log(responseBody);

            return false;
        }

}