files tree made better.

src/Yavsc/Services/MailSender.cs

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+using System;
+using System.Threading.Tasks;
+using MailKit.Net.Smtp;
+using MailKit.Security;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.OptionsModel;
+using MimeKit;
+using Yavsc.Abstract.Manage;
+
+namespace Yavsc.Services
+{
+    public class MailSender : IEmailSender
+    {
+        private ILogger _logger;
+        SiteSettings siteSettings;
+        SmtpSettings smtpSettings;
+
+        public MailSender(
+            ILoggerFactory loggerFactory, 
+            IOptions<SiteSettings> sitesOptions, 
+            IOptions<SmtpSettings> smtpOptions,
+            IOptions<GoogleAuthSettings> googleOptions
+            )
+        {
+            _logger = loggerFactory.CreateLogger<MailSender>();
+            siteSettings = sitesOptions?.Value;
+            smtpSettings = smtpOptions?.Value;
+        }
+        
+        /// <summary>
+        ///
+        /// </summary>
+        /// <param name="googleSettings"></param>
+        /// <param name="registrationId"></param>
+        /// <param name="ev"></param>
+        /// <returns>a MessageWithPayloadResponse,
+        /// <c>bool somethingsent = (response.failure == 0 &amp;&amp; response.success > 0)</c>
+        /// </returns>
+        
+
+        public async Task<EmailSentViewModel> SendEmailAsync(string username, string email, string subject, string message)
+        {
+            EmailSentViewModel model = new EmailSentViewModel{ EMail = email };
+            try
+            {
+                MimeMessage msg = new MimeMessage();
+                msg.From.Add(new MailboxAddress(
+                    siteSettings.Owner.Name,
+                siteSettings.Owner.EMail));
+                msg.To.Add(new MailboxAddress(username, email));
+                msg.Body = new TextPart("plain")
+                {
+                    Text = message
+                };
+                msg.Subject = subject;
+                msg.MessageId = MimeKit.Utils.MimeUtils.GenerateMessageId(
+                    siteSettings.Authority
+                );
+                using (SmtpClient sc = new SmtpClient())
+                {
+                    sc.Connect(
+                        smtpSettings.Host,
+                        smtpSettings.Port,
+                        SecureSocketOptions.None);
+                    await sc.SendAsync(msg);
+                    model.MessageId = msg.MessageId;
+                    model.Sent = true; // a duplicate info to remove from the view model, that equals to MessageId == null
+                }
+            }
+            catch (Exception ex)
+            {
+                model.Sent = false;
+                model.ErrorMessage = ex.Message;
+                return model;
+            }
+            return model;
+        }
+
+    }
+}