Email service for donet (and Umbraco) using mailkit

EmailService.cs

using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;
using MimeKit.Text;
using System.Collections.Generic;

namespace Logic.Services
{
    public class EmailService
    {
        public void SendEmail(Dictionary<string, string> to, string message, string replyToEmail, string replyToName, string subject)
        {
            var email = BuildEmail(to, message, replyToEmail, replyToName, subject);
            SendEmail(email);
        }

        private MimeMessage BuildEmail(Dictionary<string, string> to, string message, string replyToEmail, string replyToName, string subject)
        {
            var email = new MimeMessage();
            foreach (var entry in to)
            {
                email.To.Add(new MailboxAddress(entry.Key, entry.Value));
            }

            email.From.Add(new MailboxAddress("this is a great email", "[email protected]"));
            email.Subject = subject;

            if (replyToEmail != null)
            {
                email.ReplyTo.Add(new MailboxAddress(replyToName, replyToEmail));
            }

            email.Body = new TextPart(TextFormat.Html)
            {
                Text = message
            };

            return email;
        }

        private void SendEmail(MimeMessage email)
        {
            var host = "smtp.sendgrid.net";
            var port = 587;
            var username = "USER";
            var password = "PASS";
            using (SmtpClient client = new SmtpClient())
            {
                client.Connect(host, port, SecureSocketOptions.StartTlsWhenAvailable);
                client.Authenticate(username, password);
                client.Send(email);
                client.Disconnect(true);
            }
        }
    }
}