laatzen/LaaProductionWeb/LaaProductionWeb.API/Models/SMTP/SMTPClient.cs

namespace LaaProductionWeb.API.Models.SMTP
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Net.Mail;
    using System.Threading.Tasks;

    public class SMTPClient
    {
        private readonly SMTPSettings settings;

        public SMTPClient(SMTPSettings settings) 
            => this.settings = settings;

        public async Task<bool> SendAsync(string subject, string body, string from, IEnumerable<string> to)
        {
            try
            {
                using (var client = new SmtpClient(settings.Host, settings.Port))
                {
                    client.Host = this.settings.Host;
                    client.Port = this.settings.Port;
                    client.UseDefaultCredentials = true;

                    var message = new MailMessage
                    {
                        From = new MailAddress(from),
                        Subject = subject,
                        Body = body,
                        IsBodyHtml = true,
                    };

                    foreach (var email in to)
                    {
                        message.To.Add(email);
                    }

                    await client.SendMailAsync(message);
                }

                return true;
            }
            catch (Exception e)
            {
                File.AppendAllLines("smtp.log", new[] { $"[SMTP_ERROR] {e.Message}" });

                return false;
            }
        }
    }
}