Added backend

gswi.SMTP.Service/SMTPClientImpl.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using MailKit.Net.Smtp;
+using MailKit.Security;
+using MimeKit;
+using MimeKit.Text;
+using NLog;
+using gswi.Configuration;
+using gswi.Model.Filters;
+using gswi.SMTP.Interface;
+using gswi.SMTP.Model;
+
+namespace gswi.SMTP.Service
+{
+    public class SMTPClientImpl : ISMTPClient
+    {
+        private readonly EMailSettings _emailSettings;
+        private static Logger _logger = LogManager.GetCurrentClassLogger();
+
+        public SMTPClientImpl(EMailSettings emailSettings)
+        {
+            this._emailSettings = emailSettings;
+        }
+
+        public async Task SendEmailAsync(EMail email)
+        {
+            var emailMessage = new MimeMessage();
+
+            emailMessage.From.Add(new MailboxAddress(_emailSettings.FromName, _emailSettings.FromAddress));
+            emailMessage.To.Add(new MailboxAddress("", email.Receiver));
+            emailMessage.Subject = email.Subject;
+            emailMessage.Body = new TextPart(TextFormat.Html) { Text = $"{email.Message}<br><br>Dies ist eine Automatische E-Mail.<br>Gesendet von Login counter @ {System.Net.Dns.GetHostName()}" };
+
+            using (var client = new SmtpClient())
+            {
+                client.Timeout = 30000;
+                try
+                {
+                    await client.ConnectAsync(_emailSettings.MailServerAddress, _emailSettings.MailServerPort, SecureSocketOptions.Auto).ConfigureAwait(false);
+                }
+                catch (Exception ex)
+                {
+                    _logger.Error(ex);
+                    throw new ServiceException(ServiceErrorCode.ConnectionFailed, "Connection to mail server failed");
+                }
+
+                try
+                {
+                    await client.AuthenticateAsync(new NetworkCredential(_emailSettings.Username, _emailSettings.Credentials));
+                }
+                catch (Exception ex)
+                {
+                    _logger.Error(ex);
+                    throw new ServiceException(ServiceErrorCode.InvalidUser, "Authentification to mail server failed");
+                }
+
+                try
+                {
+                    await client.SendAsync(emailMessage).ConfigureAwait(false);
+                }
+                catch (Exception ex)
+                {
+                    _logger.Error(ex);
+                    throw new ServiceException(ServiceErrorCode.MailError, "Unable to send email");
+                }
+
+                try
+                {
+                    await client.DisconnectAsync(true).ConfigureAwait(false);
+                }
+                catch (Exception ex)
+                {
+                    _logger.Error(ex);
+                    throw new ServiceException(ServiceErrorCode.ConnectionFailed, "Unable to disconnect from mail server");
+                }
+            }
+        }
+    }
+}

gswi.SMTP.Service/gswi.SMTP.Service.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	<ItemGroup>
+		<ProjectReference Include="..\gswi.SMTP.Model\gswi.SMTP.Model.csproj"/>
+		<ProjectReference Include="..\gswi.SMTP.Interface\gswi.SMTP.Interface.csproj"/>
+		<ProjectReference Include="..\gswi.Configuration\gswi.Configuration.csproj"/>
+		<ProjectReference Include="..\gswi.Model\gswi.Model.csproj"/>
+	</ItemGroup>
+	<ItemGroup>
+		<PackageReference Include="NETCore.MailKit" Version="2.0.3"/>
+		<PackageReference Include="nlog" Version="4.7.13"/>
+	</ItemGroup>
+	<PropertyGroup>
+		<TargetFramework>net6.0</TargetFramework>
+	</PropertyGroup>
+</Project>