添加项目文件。

TightWiki.Email/TightWiki.Email.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Version>2.20.1</Version>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)'=='Release'">
+    <DebugSymbols>False</DebugSymbols>
+    <DebugType>None</DebugType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MailKit" Version="4.9.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\TightWiki.Repository\TightWiki.Repository.csproj" />
+  </ItemGroup>
+
+</Project>

TightWiki.Email/WikiEmailSender.cs

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+using MailKit.Net.Smtp;
+using MailKit.Security;
+using Microsoft.Extensions.Logging;
+using MimeKit;
+using TightWiki.Library.Interfaces;
+using TightWiki.Repository;
+
+namespace TightWiki.Email
+{
+    public class WikiEmailSender : IWikiEmailSender
+    {
+        private readonly ILogger<WikiEmailSender> _logger;
+
+        public WikiEmailSender(ILogger<WikiEmailSender> logger)
+        {
+            _logger = logger;
+        }
+
+        public async Task SendEmailAsync(string email, string subject, string htmlMessage)
+        {
+            try
+            {
+                var values = ConfigurationRepository.GetConfigurationEntryValuesByGroupName("Email");
+                var smtpPassword = values.Value<string>("Password");
+                var smtpUsername = values.Value<string>("Username");
+                var smtpAddress = values.Value<string>("Address");
+                var smtpFromDisplayName = values.Value<string>("From Display Name");
+                var smtpUseSSL = values.Value<bool>("Use SSL");
+                int smtpPort = values.Value<int>("Port");
+
+                if (string.IsNullOrEmpty(smtpAddress) || string.IsNullOrEmpty(smtpUsername))
+                {
+                    return;
+                }
+
+                var message = new MimeMessage();
+                message.From.Add(new MailboxAddress(smtpFromDisplayName, smtpUsername));
+                message.To.Add(new MailboxAddress(email, email));
+                message.Subject = subject;
+                message.Body = new TextPart("html") { Text = htmlMessage };
+
+                using var client = new SmtpClient();
+                var options = smtpUseSSL ? SecureSocketOptions.SslOnConnect : SecureSocketOptions.StartTlsWhenAvailable;
+                await client.ConnectAsync(smtpAddress, smtpPort, options);
+                await client.AuthenticateAsync(smtpUsername, smtpPassword);
+                await client.SendAsync(message);
+                await client.DisconnectAsync(true);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, ex.Message);
+                ExceptionRepository.InsertException(ex);
+            }
+        }
+    }
+}