refact.

Yavsc.Server/Services/IEmailSender.cs

@@ -0,0 +1,10 @@
+
+using System.Threading.Tasks;
+
+namespace Yavsc.Services
+{
+    public interface IEmailSender
+    {
+        Task<bool> SendEmailAsync(SiteSettings siteSettings, SmtpSettings smtpSettings, string username, string email, string subject, string message);
+    }
+}