初步完成邮件功能

DMS.Core/Interfaces/Services/IEmailService.cs

@@ -0,0 +1,33 @@
+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Services
+{
+    /// <summary>
+    /// 邮件服务接口
+    /// </summary>
+    public interface IEmailService
+    {
+        /// <summary>
+        /// 异步发送邮件
+        /// </summary>
+        /// <param name="message">邮件消息</param>
+        /// <param name="account">邮件账户</param>
+        /// <returns>发送是否成功</returns>
+        Task<bool> SendEmailAsync(EmailMessage message, EmailAccount account);
+
+        /// <summary>
+        /// 异步接收邮件
+        /// </summary>
+        /// <param name="account">邮件账户</param>
+        /// <param name="count">接收邮件数量</param>
+        /// <returns>接收到的邮件列表</returns>
+        Task<List<EmailMessage>> ReceiveEmailsAsync(EmailAccount account, int count = 10);
+
+        /// <summary>
+        /// 测试邮件账户连接
+        /// </summary>
+        /// <param name="account">邮件账户</param>
+        /// <returns>连接是否成功</returns>
+        Task<bool> TestConnectionAsync(EmailAccount account);
+    }
+}