using MailKit;
using MailKit.Net.Imap;
using MailKit.Search;
using MimeKit;

　　　　　/// <summary>
        /// IMAP 读取邮箱信息   MimeKit包下 
        /// </summary>
        public static void IMAP()
        {
            try
            {
                //注册字符集，缺失字符集，一些中文编码数据为乱码 --千万别删，不然就是乱码了
                Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
                // 设置IMAP服务器地址、端口、用户名和密码
                string imapServer = "smtp.com";
                int port = 993;//这里是993，不要考虑什么110、25的
                string username = "";   //用户名
                string password = "";    //密码

                // 创建IMAP客户端
                using (var client = new ImapClient())
                {
                    //client.Connect(imapServer, port, true);
                    client.Connect(imapServer);
                    client.Authenticate(username, password);

                    // 打开发件箱  不可随哟更改邮箱文件夹名称和移动邮件
                    //var folder = client.GetFolder("已发送邮件");
                    var folder = client.GetFolder("StockReleationFiles");//这里是你邮箱的文件夹（需要自己在邮箱设置）

                    folder.Open(FolderAccess.ReadOnly);

                    // 获取收件箱中的邮件数量
                    Console.WriteLine("收件箱中共有 {0} 封邮件", folder.Count);
                    //获取昨天到今天的邮件 一般两天足已
                    var uidss = folder.Search(SearchQuery.DeliveredAfter(DateTime.Parse(DateTime.Now.AddDays(-1).ToString("yyyy-MM-dd"))));

                    string savePath = @"D:\Syn\Email\";
                    if (!Directory.Exists(savePath)) Directory.CreateDirectory(savePath);

                    //获取完整邮件
                    foreach (var item in uidss)
                    {
                        MimeMessage message = folder.GetMessage(new UniqueId(item.Id));
                        Console.WriteLine("邮件主题：{0}", message.Subject);
                        //获取邮件附件
                        var files = folder.GetMessage(new UniqueId(item.Id));
                        var items = files.Attachments;
                        foreach (var attachment in items)
                        {
                            if (attachment is MessagePart)
                            {
                                var fileName = attachment.ContentDisposition?.FileName;
                                var rfc = (MessagePart)attachment;
                                if (string.IsNullOrEmpty(fileName))
                                    fileName = "attached-message.eml";

                                Console.WriteLine("邮件附件文件：{0}", fileName);
                                //下载
                                using (var stream = File.Create(savePath + fileName))
                                {
                                    rfc.Message.WriteTo(stream);
                                }
                            }
                            else
                            {
                                var part = (MimePart)attachment;
                                var fileName = part.FileName;

                                Console.WriteLine("邮件附件文件：{0}", fileName);
                                //下载
                                using (var stream = File.Create(savePath + fileName))
                                {
                                    part.Content.DecodeTo(stream);
                                }
                            }
                        }
                    }

                    //必须得关，坑已经踩过了
                    client.Disconnect(true);
                    client.Dispose();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("读取收件箱失败：" + ex.Message);
            }
        }

//获取未读的邮件
var uidss = folder.Search(SearchQuery.NotSeen);

//标记已读（这里记得将前面的模式改成ReadWrite =》 folder.Open(FolderAccess.ReadWrite); ）
folder.SetFlags(new UniqueId(item.Id), MessageFlags.Seen, true);

//内容按照换行分隔
string[] lines = content.Split(new string[] { "\r\n" }, StringSplitOptions.None);