mailkit库用于收发邮件.这个库可以替代C#自带的发邮件库
环境 W10 / VS2017CMMT / MailKit version="2.0.3" "net46" / MimeKit version="2.0.3" "net46"
mailkit使用nuget下载或者到GIT https://github.com/jstedfast/MailKit
邮件收发是与邮件服务器交互,原理参考 https://www.cnblogs.com/ysocean/p/7652934.html
帮助类参考部份mailkit源码.可简单实现发邮件与收邮件.在处理大附件,草稿保存,时未找到解决办法
1 public class MyMailKit 2 { 3 #region 属性 账户配置信息等 4 /// <summary> 5 /// 发件人邮箱地址 6 /// </summary> 7 private string fromEmail = null; 8 /// <summary> 9 /// 发件人别名 10 /// </summary> 11 private string fromAlias = null; 12 /// <summary> 13 /// 发件人邮箱密码(或授权码) 14 /// </summary> 15 private string fromPwd = null; 16 /// <summary> 17 /// SMTP服务器地址 18 /// </summary> 19 private string serverSMTP = null; 20 private int portSMTP = 0; 21 /// <summary> 22 /// IMAP服务器地址 23 /// </summary> 24 private string serverIMAP = null; 25 private int portIMAP = 0; 26 /// <summary> 27 /// POP服务器地址 28 /// </summary> 29 private string serverPOP = null; 30 private int portPOP = 0; 31 /// <summary> 32 /// 邮件账户(收邮件时登录账户) 33 /// </summary> 34 private string account = null; 35 /// <summary> 36 /// 邮件账户密码(收邮件时登录密码) 37 /// </summary> 38 private string pwd = null; 39 #endregion 40 41 #region 属性 邮件主体内容 内容块容器 42 43 /// <summary> 44 /// 邮件对象 45 /// </summary> 46 private MimeMessage message = null; 47 /// <summary> 48 /// 邮件内容块的容器 放置邮件正文,附件等内容块 49 /// </summary> 50 private Multipart mimeparts = null; 51 /// <summary> 52 /// 收件人列表 53 /// </summary> 54 private List<MailboxAddress> toList = null; 55 /// <summary> 56 /// 附件列表 57 /// </summary> 58 private List<MimePart> attaList = null; 59 #endregion 60 61 /// <summary> 62 /// 操作异常信息 63 /// </summary> 64 public string ErrMsg { get; private set; } 65 66 #region 制作与发送邮件 67 68 /// <summary> 69 /// 添加一个收件人 70 /// 在制作邮件方法之前调用 71 /// </summary> 72 /// <param name="address">收件人地址</param> 73 /// <param name="name"></param> 74 public void AddTo(string address, string name = null) 75 { 76 if (this.toList == null) 77 this.toList = new List<MailboxAddress>(); 78 if (string.IsNullOrWhiteSpace(name)) 79 name = address.Substring(0, address.IndexOf('@')); 80 this.toList.Add(new MailboxAddress(name, address)); 81 } 82 83 /// <summary> 84 /// 添加一个附件 85 /// 在制作邮件方法之前调用 86 /// </summary> 87 /// <param name="atta">附件流</param> 88 /// <param name="name">附件名字</param> 89 /// <param name="size">附件大小(K)</param> 90 public void AddAttachment(Stream atta, string name, long size = 0) 91 { 92 try 93 { 94 if (this.attaList == null) 95 this.attaList = new List<MimePart>(); 96 // 附件内容块 97 MimePart attapart = new MimePart(); 98 attapart.Content = new MimeContent(atta); 99 100 // 内容描述为附件 101 attapart.ContentDisposition = new ContentDisposition(ContentDisposition.Attachment); 102 103 // 附件名字设置,如果名字有中文也没关系 104 attapart.ContentDisposition.FileName = name; 105 // 大小设置 106 if (size > 0) 107 attapart.ContentDisposition.Size = size; 108 109 // 采用base64编码传输 110 attapart.ContentTransferEncoding = ContentEncoding.Base64; 111 112 // 113 this.attaList.Add(attapart); 114 } 115 catch (Exception e) 116 { 117 ErrMsg = $"添加附件异常:{e.ToString()} [{e.Message}]"; 118 } 119 } 120 121 /// <summary> 122 /// 制作一封邮件 123 /// 调用此方法之前,先调用邮件配置初始化方法和添加收件人,添加附件方法 124 /// </summary> 125 /// <param name="subject">邮件主题(标题)</param> 126 /// <param name="body">邮件正文(内容)</param> 127 /// <param name="ishtml">正文是否为HTML格式,纯文本格式=false</param> 128 public void MakeEmail(string subject, string body, bool ishtml = true) 129 { 130 try 131 { 132 // 邮件类新实例 133 message = new MimeMessage(); 134 135 // 设置邮件主题 136 message.Subject = subject; 137 138 // 设置发件人信息 139 message.From.Add(new MailboxAddress(fromAlias, fromEmail)); 140 141 // 设置收件人信息 142 message.To.AddRange(this.toList); 143 144 // 设置邮件正文 145 var content = new TextPart(ishtml ? "html" : "plain"); 146 content.SetText(Encoding.UTF8, body); 147 148 // 建立内容块容器,将内容或附件等添加到其中 MimeEntity是各种类型内容的基类 149 mimeparts = new Multipart("mixed"); 150 mimeparts.Add(content); 151 // 附件 152 if (this.attaList != null) 153 { 154 foreach (var atta in this.attaList) 155 { 156 mimeparts.Add(atta); 157 } 158 } 159 160 // 将内容块容器设置到邮件的内容.到此已经填好邮件实体的主要属性 161 message.Body = mimeparts; 162 } 163 catch (Exception e) 164 { 165 ErrMsg = $"制作邮件异常:{e.ToString()} [{e.Message}]"; 166 } 167 } 168 169 /// <summary> 170 /// 设置此邮件是对指定邮件的回复(这是一封回复邮件) 171 /// 在调用制作邮件方法之后调用,在发送前调用.需要调用收件配置方法CfgIMAP() 172 /// </summary> 173 /// <param name="uniqueid">被回复邮件唯一标识</param> 174 /// <param name="folderName">被回复邮件文件夹</param> 175 public void SetReplyTo(uint uniqueid, string folderName = null) 176 { 177 try 178 { 179 // 被回复的邮件 180 MimeMessage remail; 181 // 查找这个被回复的邮件,设置回复状态 182 using (var client = ConnectIMAP()) 183 { 184 if (folderName == null) 185 folderName = client.Inbox.Name; 186 var emailUniqueId = new UniqueId(uniqueid); 187 var folder = client.GetFolder(folderName); 188 folder.Open(FolderAccess.ReadWrite); 189 190 remail = folder.GetMessage(emailUniqueId); 191 folder.AddFlags(emailUniqueId, MessageFlags.Answered, true); 192 folder.Close(); 193 client.Disconnect(true); 194 } 195 // construct the In-Reply-To and References headers 196 if (!string.IsNullOrEmpty(remail.MessageId)) 197 { 198 // 设置此邮件是对这个MESSAGEID的邮件的回复 199 message.InReplyTo = remail.MessageId; 200 // 此邮件的"对其它消息"的引用属性设为这个邮件的引用属性 201 foreach (var id in remail.References) 202 message.References.Add(id); 203 message.References.Add(remail.MessageId); 204 } 205 // 回复邮件主题前面加RE: 206 if (!message.Subject.StartsWith("RE:", StringComparison.OrdinalIgnoreCase)) 207 message.Subject = "RE:" + message.Subject; 208 } 209 catch (Exception e) 210 { 211 ErrMsg = $"设置为回复邮件异常:{e.ToString()} [{e.Message}]"; 212 } 213 } 214 215 /// <summary> 216 /// 设置 217 /// </summary> 218 /// <param name="uniqueid"></param> 219 /// <param name="folderName"></param> 220 //public void SetForWard(uint uniqueid, string folderName = null) 221 //{ 222 223 //} 224 225 /// <summary> 226 /// 发送一个邮件 227 /// 调用此方法之前,请先调用建立邮件的方法MakeMessage() 228 /// </summary> 229 public bool SendEmail() 230 { 231 try 232 { 233 // 建立发件服务客户端 234 using (var client = new SmtpClient()) 235 { 236 // SMTP服务器 237 client.Connect(serverSMTP, portSMTP); 238 239 // 登录 240 client.Authenticate(fromEmail, fromPwd); 241 242 // 发邮件 243 client.Send(message); 244 245 // 关闭连接 246 client.Disconnect(true); 247 return true; 248 } 249 } 250 catch (Exception e) 251 { 252 ErrMsg = $"发送邮件异常:{e.ToString()} [{e.Message}]"; 253 return false; 254 } 255 } 256 257 #endregion 258 259 #region 接收与处理邮件 260 261 /// <summary> 262 /// 连接到IMAP服务器 263 /// </summary> 264 private ImapClient ConnectIMAP() 265 { 266 try 267 { 268 ImapClient client = new ImapClient(); 269 client.Connect(serverIMAP, portIMAP); 270 client.Authenticate(account, pwd); 271 272 /**********************************************************************/ 273 // 网易126 163相关邮箱时,要用这两句话,表明客户端身份.在连接后调用.否则无法登录邮箱. 274 var clientImplementation = new ImapImplementation 275 { 276 Name = "MeSince", 277 Version = "2.0" 278 }; 279 var serverImplementation = client.Identify(clientImplementation); 280 /*********************************************************************/ 281 282 return client; 283 } 284 catch (Exception e) 285 { 286 ErrMsg = $"连接到IMAP服务器异常:{e.ToString()} [{e.Message}]"; 287 return null; 288 } 289 } 290 291 /// <summary> 292 /// 获取邮箱的所有文件夹列表 293 /// 调用前先调用配置方法CfgIMAP() 294 /// </summary> 295 public EmailViewM GetFolders() 296 { 297 try 298 { 299 using (var client = ConnectIMAP()) 300 { 301 List<IMailFolder> mailFolderList = client.GetFolders(client.PersonalNamespaces[0]).ToList(); 302 var entity = FillEntity(null, null, mailFolderList.ToArray()); 303 client.Disconnect(true); 304 // 305 return entity; 306 } 307 } 308 catch (Exception e) 309 { 310 ErrMsg = $"获取邮箱的所有文件夹异常:{e.ToString()} [{e.Message}]"; 311 return null; 312 } 313 } 314 315 /// <summary> 316 /// 根据唯一标识和文件夹名,获取单个邮件 317 /// </summary> 318 /// <param name="folderName"></param> 319 /// <returns></returns> 320 public EmailViewM GetEmailByUid(uint uniqueid, string folderName = null) 321 { 322 try 323 { 324 using (ImapClient client = ConnectIMAP()) 325 { 326 if (folderName == null) 327 folderName = client.Inbox.Name; 328 IMailFolder folder = client.GetFolder(folderName); 329 folder.Open(FolderAccess.ReadOnly); 330 var email = folder.GetMessage(new UniqueId(uniqueid)); 331 var entity = FillEntity(null, email); 332 // 333 folder.Close(); 334 client.Disconnect(true); 335 // 336 return entity; 337 } 338 } 339 catch (Exception e) 340 { 341 ErrMsg = $"获取单个邮件异常:{e.ToString()} [{e.Message}]"; 342 return null; 343 } 344 } 345 346 /// <summary> 347 /// 获取一个文件夹的邮件 返回一个列表,包含摘要信息.收件/发件人,有几个附件,时间和标题,是否已读 348 /// 默认只获取3个月内的邮件 349 /// 调用前先调用配置方法CfgIMAP() 350 /// </summary> 351 public List<EmailViewM> GetEmailByFolder(string folderName = null) 352 { 353 try 354 { 355 using (ImapClient client = ConnectIMAP()) 356 { 357 IMailFolder folder; 358 // 默认是收件箱 359 if (folderName == null||folderName.ToLower()=="inbox") 360 { 361 folder=client.GetFolder(client.Inbox.Name); 362 } 363 else { 364 // 其它特定的文件夹 365 string dirK = folderName.ToLower(); 366 Dictionary<string, SpecialFolder> fdict = new Dictionary<string, SpecialFolder>(); 367 fdict.Add("archive", SpecialFolder.Archive); 368 fdict.Add("drafts", SpecialFolder.Drafts); 369 fdict.Add("flagged", SpecialFolder.Flagged); 370 fdict.Add("sent", SpecialFolder.Sent); 371 fdict.Add("junk", SpecialFolder.Junk); 372 fdict.Add("trash", SpecialFolder.Trash); 373 if (fdict.ContainsKey(dirK)) 374 folder = client.GetFolder(fdict[dirK]); 375 else 376 { 377 // 否则是自定义的文件夹,或者是邮件服务商的特别文件夹 378 folder = client.GetFolder(folderName); 379 } 380 } 381 382 folder.Open(FolderAccess.ReadOnly); 383 384 // 获取所有邮件的唯一标识列表 385 SearchQuery sq = SearchQuery.DeliveredAfter(DateTime.Today.AddMonths(-3)); 386 var emailUids = folder.Search(sq); 387 388 // 获取这些邮件的摘要信息(MessageSummaryItems.BodyStructure这个项可以知道是否带附件) 389 var mails = folder.Fetch(emailUids, MessageSummaryItems.UniqueId | MessageSummaryItems.BodyStructure | MessageSummaryItems.Full); 390 List<EmailViewM> entityls = new List<EmailViewM>(); 391 foreach (var emhead in mails) 392 { 393 var entity = FillEntity(emhead, null, folder); 394 entityls.Add(entity); 395 } 396 // 397 folder.Close(); 398 client.Disconnect(true); 399 // 400 return entityls; 401 } 402 } 403 catch (Exception e) 404 { 405 ErrMsg = $"获取一个文件夹的邮件异常:{e.ToString()} [{e.Message}]"; 406 return null; 407 } 408 } 409 410 /// <summary> 411 /// 使用唯一ID获取一封完整邮件 412 /// 调用前先调用配置方法CfgIMAP() 413 /// </summary> 414 /// <param name="folder">文件夹名,默认是收件箱</param> 415 /// <param name="uniqueid">邮件唯一编号</param> 416 public EmailViewM GetEmailByUniqueId(uint uniqueid, string folderName = null) 417 { 418 try 419 { 420 using (ImapClient client = ConnectIMAP()) 421 { 422 if (folderName == null) 423 folderName = client.Inbox.Name; 424 IMailFolder folder = client.GetFolder(folderName); 425 folder.Open(FolderAccess.ReadWrite); 426 UniqueId emailUniqueId = new UniqueId(uniqueid); 427 428 // 获取这些邮件的摘要信息 429 List<UniqueId> uids = new List<UniqueId>(); 430 uids.Add(emailUniqueId); 431 var emaills = folder.Fetch(uids, MessageSummaryItems.UniqueId | MessageSummaryItems.Envelope); 432 var emhead = emaills[0]; 433 434 // 获取邮件含正文部分,然后设置为已读. 435 MimeMessage embody = folder.GetMessage(emailUniqueId); 436 folder.AddFlags(emailUniqueId, MessageFlags.Seen, true); 437 438 /*赋值到实体类*/ 439 var entity = FillEntity(emhead, embody, folder); 440 // 441 folder.Close(); 442 client.Disconnect(true); 443 // 444 return entity; 445 } 446 } 447 catch (Exception e) 448 { 449 ErrMsg = $"获取单个完整邮件异常:{e.ToString()} [{e.Message}]"; 450 return null; 451 } 452 } 453 454 /// <summary> 455 /// 邮件添加标识(已读,已回复,已删除等等).参数值参考EmailViewM实体同名属性 456 /// 调用前先调用配置方法CfgIMAP() 457 /// </summary> 458 /// <param name="uniqueIdls">同一文件夹下的邮件唯一标识列表</param> 459 /// <param name="flag">标识代码 1=已读 2=已回复 8=删除</param> 460 /// <param name="folderType">文件夹名</param> 461 public void SetFlag(List<uint> uniqueIdls, int flag, string folderType = null) 462 { 463 try 464 { 465 using (ImapClient client = ConnectIMAP()) 466 { 467 List<UniqueId> uniqueids = uniqueIdls.Select(o => new UniqueId(o)).ToList(); 468 MessageFlags messageFlags = (MessageFlags)flag; 469 if (folderType == null) 470 folderType = client.Inbox.Name; 471 IMailFolder folder = client.GetFolder(folderType); 472 folder.Open(FolderAccess.ReadWrite); 473 folder.AddFlags(uniqueids, messageFlags, true); 474 // 475 folder.Close(); 476 client.Disconnect(true); 477 } 478 } 479 catch (Exception e) 480 { 481 ErrMsg = $"邮件添加标识时异常:{e.ToString()} [{e.Message}]"; 482 } 483 } 484 485 /// <summary> 486 /// 将邮件保存到草稿箱 返回邮件的唯一标识 487 /// 调用前先调用配置方法CfgIMAP(),调用制做邮件方法 488 /// </summary> 489 public int SaveDrafts(int uniqueId = -1) 490 { 491 try 492 { 493 using (ImapClient client = ConnectIMAP()) 494 { 495 // 打开草稿箱,添加邮件 496 IMailFolder folder = client.GetFolder(SpecialFolder.Drafts); 497 folder.Open(FolderAccess.ReadWrite); 498 499 // 如果保存的是已经有的草稿邮件,则删除它再保存新的草稿.(没找到保存已有草稿的办法) 500 if (uniqueId > -1) 501 { 502 List<UniqueId> uidls = new List<UniqueId>(); 503 uidls.Add(new UniqueId((uint)uniqueId)); 504 folder.SetFlags(uidls, MessageFlags.Seen | MessageFlags.Deleted, true); 505 folder.Expunge(uidls); 506 } 507 508 UniqueId? uid = folder.Append(this.message, MessageFlags.Seen | MessageFlags.Draft); 509 // 510 folder.Close(); 511 client.Disconnect(true); 512 return uid.HasValue ? (int)uid.Value.Id : -1; 513 } 514 } 515 catch (Exception e) 516 { 517 ErrMsg = $"邮件保存草稿时异常:{e.ToString()} [{e.Message}]"; 518 return -1; 519 } 520 } 521 #endregion 522 523 /// <summary> 524 /// 将邮件相关信息填充到实体对象 525 /// </summary> 526 /// <param name="emhead">邮件基本信息</param> 527 /// <param name="embody">邮件详细信息</param> 528 /// <param name="folders">邮箱文件夹</param> 529 /// <returns></returns> 530 private EmailViewM FillEntity(IMessageSummary emhead = null, MimeMessage embody = null, params IMailFolder[] folders) 531 { 532 try 533 { 534 // 邮件基本信息 主题(标题),发件人名,地址,日期,状态等 535 EmailViewM entity = new EmailViewM(); 536 if (emhead != null) 537 { 538 entity.UniqueId = emhead.UniqueId.Id; 539 if (emhead.Envelope.From.Count > 0) 540 { 541 entity.Name = emhead.Envelope.From.Mailboxes.ElementAt(0).Name; 542 entity.Address = emhead.Envelope.From.Mailboxes.ElementAt(0).Address; 543 } 544 entity.Date = emhead.Envelope.Date.Value.DateTime; 545 entity.Subject = emhead.Envelope.Subject; 546 if (folders.Length > 0) 547 { 548 entity.FolderType = folders[0].Name; 549 } 550 // 收件人可能有多个 551 entity.ToList = new List<EmailViewM>(); 552 foreach (var to in emhead.Envelope.To.Mailboxes) 553 { 554 entity.ToList.Add(new EmailViewM { Name = to.Name, Address = to.Address }); 555 } 556 // 邮件状态,已读未读等等 557 if (emhead.Flags.HasValue) 558 { 559 entity.IsRead = emhead.Flags.Value.HasFlag(MessageFlags.Seen); 560 entity.IsAnswered = emhead.Flags.Value.HasFlag(MessageFlags.Answered); 561 } 562 // 附件个数(只传emhead时) 563 entity.Count = emhead.Attachments.Count(); 564 } 565 566 // 正文 附件 567 if (embody != null) 568 { 569 // 正文 570 entity.BodyText = embody.TextBody; 571 entity.BodyHTML = embody.HtmlBody; 572 573 // 附件 574 // 附件个数(传embody时,包含有附件完整信息) 575 entity.Count = embody.Attachments.Count(); 576 // 附件信息 577 if (entity.Count > 0) 578 { 579 entity.AttaList = new List<EmailViewM>(); 580 // 这里要转成mimepart类型 581 foreach (MimePart attachment in embody.Attachments) 582 { 583 var atta = new EmailViewM(); 584 atta.Name = attachment.ContentDisposition.FileName; 585 atta.AttaStream = new MemoryStream(); 586 attachment.Content.DecodeTo(atta.AttaStream); 587 atta.Size = Math.Round((double)atta.AttaStream.Length / 1024, 1).ToString(); 588 entity.AttaList.Add(atta); 589 } 590 } 591 } 592 // 邮箱文件夹 593 if (folders.Length > 0) 594 { 595 entity.FolderList = new List<EmailViewM>(); 596 foreach (var item in folders) 597 { 598 entity.FolderList.Add(new EmailViewM() 599 { 600 Name = item.Name, 601 FolderType = item.Attributes.ToString(), 602 Count = item.Count 603 }); 604 } 605 } 606 return entity; 607 } 608 catch (Exception e) 609 { 610 ErrMsg = $"邮件填充到实体时异常:{e.ToString()} [{e.Message}]"; 611 return null; 612 } 613 } 614 615 #region 配置账号密码方法 616 617 /// <summary> 618 /// 初始化一个发件人的配置,发件箱,发件箱密码,SMTP服务器 619 /// </summary> 620 /// <param name="emailCode"></param> 621 public void CfgSendEmail(int emailCode) 622 { 623 switch (emailCode) 624 { 625 default: 626 fromAlias = "发件人名称"; 627 fromEmail = "发件人地址"; 628 fromPwd = "授权码或密码"; 629 serverSMTP = "smtp服务器地址"; 630 portSMTP = 25; 631 break; 632 } 633 } 634 635 /// <summary> 636 /// 初始化一个接收邮件的配置 登录名和密码,IMAP服务器, 637 /// </summary> 638 /// <param name="accountCode"></param> 639 public void CfgIMAP(int accountCode) 640 { 641 switch (accountCode) 642 { 643 default: 644 account = "邮件地址"; 645 pwd = "邮件密码或者授权码";//""; 646 serverIMAP = "IMAP服务器地址"; 647 portIMAP = 143; 648 //serverPOP = "POP3服务器地址"; 649 //portPOP = 110; 650 break; 651 } 652 } 653 654 #endregion 655 }
public class EmailViewM { /// <summary> /// 1.从服务器上获取的邮件的UniqueId /// </summary> public uint UniqueId { get; set; } /// <summary> /// 1.发件人名字,这个名字可能为null.因为发件人可以不设名字 /// 2.收件人名(只在ToList里的对象有值) /// 3.附件名(只在AttaList里的对象有值) /// 4.文件夹名字(只在FolderList里的对象有值) /// </summary> public string Name { get; set; } /// <summary> /// 1.发件人地址 /// 2.收件人地址(只在ToList里的对象有值) /// </summary> public string Address { get; set; } /// <summary> /// 发件人邮箱授权码 /// </summary> public string AuthCode { get; set; } /// <summary> /// 收件人列表 /// </summary> public List<EmailViewM> ToList { get; set; } /// <summary> /// 邮件主题(标题) /// </summary> public string Subject { get; set; } /// <summary> /// 邮件时间 /// </summary> public DateTime Date { get; set; } /// <summary> /// 1.附件个数 /// 2.文件夹内邮件个数(只在FolderList里的对象有值) /// </summary> public int Count { get; set; } /// <summary> /// 附件标识ID在保存附件在本地时设置(只在AttaList里的对象有值) /// 当附件从邮件服务器下载到本地后,需要向客户端提供下载时,用这个ID找到该附件. /// </summary> public string AttaGuid { get; set; } /// <summary> /// 附件大小(只在AttaList里的对象有值) /// </summary> public string Size { get; set; } /// <summary> /// 附件流(只在AttaList里的对象有值) /// </summary> public Stream AttaStream { get; set; } /// <summary> /// 附件列表 /// </summary> public List<EmailViewM> AttaList { get; set; } /// <summary> /// 是否已经读 /// </summary> public bool IsRead { get; set; } /// <summary> /// 是否已经回复 /// </summary> public bool IsAnswered { get; set; } /// <summary> /// 邮件正文的纯文本形式 /// </summary> public string BodyText { get; set; } /// <summary> /// 邮件正文的HTML形式. /// </summary> public string BodyHTML { get; set; } /// <summary> /// 邮箱的文件夹列表 /// </summary> public List<EmailViewM> FolderList { get; set; } /// <summary> /// 文件夹类型名 /// 1.表示当前邮件所处文件夹名字 /// 2.在FolderList里的对象,表示文件夹名字 ///inbox(收件箱), ///archive(档案箱), ///drafts(草稿箱), ///flagged(标记的), ///junk(垃圾箱), ///sent(发件箱), ///trash(回收箱) /// </summary> public string FolderType { get; set; } /// <summary> /// 邮件标识,需要修改邮件标识时,传入此值 /// 1=Seen(设为已读), /// 2=Answered(设为已经回复), /// 8=Deleted(设为删除), /// </summary> public int Flag { get; set; } }