利用C#郵件發送郵箱使用到兩個類SmtpClient和MailMessage。可以把SmtpClient看做發送郵件信息的客戶端，而把MailMessage看做需要發送的消息。

下面是我寫的發送郵件的公共方法：

1 /// <summary> 2 /// 3 /// </summary> 4 /// <param name="ServerIP">發送郵件服務器ip或者域名</param> 5 /// <param name="ServerPort">服務器端口</param> 6 /// <param name="UserName">發件人的賬號</param> 7 /// <param name="Password">發件人的密碼</param> 8 /// <param name="FromAddress">發件人的郵箱地址</param> 9 /// <param name="FromAddressName">發件人名稱</param> 10 /// <param name="Subject">主題</param> 11 /// <param name="Body">正文</param> 12 /// <param name="ToAddressList">收件人集合</param> 13 /// <param name="CCAddressList">副本收件人集合</param> 14 /// <param name="BccAddressList">密件抄送收件人集合</param> 15 /// <param name="IsHtml">正文是否可以使用html標簽</param> 16 /// <param name="AttachMentFileList">附件</param> 17 /// <param name="MailPriority">發送郵件的優先級 三個選項：低 中 高</param> 18 /// <returns></returns> 19 public String SendMail(string ServerIP, int? ServerPort, string UserName, string Password, string FromAddress, string FromAddressName, string Subject, string Body, List<string> ToAddressList, List<string> CCAddressList, List<string> BccAddressList, bool IsHtml, List<AttachmentFile> AttachMentFileList, MailPriority MailPriority) 20 { 21 try 22 { 23 if (string.IsNullOrEmpty(ServerIP)) 24 { 25 return "ServerIP 不能為空!"; 26 } 27 28 SmtpClient mSmtpClient = new SmtpClient(ServerIP); //申明SmtpClient對象 29 System.Net.Mail.MailMessage mMailMessage = new System.Net.Mail.MailMessage(); //申明MailMessage對象 30 31 if (ServerPort != null) 32 { 33 mSmtpClient.Port = (int)ServerPort; 34 } 35 36 if (String.IsNullOrEmpty(FromAddress)) 37 { 38 return "發件人不能為空"; 39 } 40 41 if (string.IsNullOrEmpty(FromAddressName)) 42 { 43 mMailMessage.From = new MailAddress(FromAddress); 44 } 45 else 46 { 47 mMailMessage.From = new MailAddress(FromAddress, FromAddressName); 48 } 49 50 if (string.IsNullOrEmpty(Subject)) 51 { 52 return "主旨不能為空!"; 53 } 54 55 if (ToAddressList == null || ToAddressList.Count() == 0) 56 { 57 return "收件人不能為空!"; 58 } 59 60 // mSmtpClient.UseDefaultCredentials = false; 61 mSmtpClient.Credentials = new NetworkCredential(UserName, Password); //設置發送人的郵箱賬號和密碼，163郵箱有設置授權碼 62 mSmtpClient.EnableSsl = true; //啟用ssl,也就是安全發送 63 64 foreach (var item in ToAddressList) //收件者 65 { 66 mMailMessage.To.Add(item); 67 } 68 if (CCAddressList != null && CCAddressList.Count() != 0) 69 { 70 foreach (var item in CCAddressList) //副本 71 { 72 mMailMessage.CC.Add(item); 73 } 74 } 75 76 if (BccAddressList != null && BccAddressList.Count() != 0) 77 { 78 foreach (var item in BccAddressList) //密件抄送人員 79 { 80 mMailMessage.Bcc.Add(item); 81 } 82 } 83 84 mMailMessage.Subject = Subject; 85 mMailMessage.IsBodyHtml = IsHtml; //正文是否使用html標簽展示 86 mMailMessage.Body = Body; //正文 87 mMailMessage.BodyEncoding = System.Text.Encoding.UTF8; //正文的編碼原則 88 mMailMessage.Priority = MailPriority; //優先級 89 90 if (AttachMentFileList != null && AttachMentFileList.Count() != 0) //判斷是否有附件 91 { 92 foreach (var item in AttachMentFileList) 93 { 94 Attachment mAttachment = new Attachment(item.FilePath); //添加文件的文職 95 mAttachment.Name = item.FileName;//附件顯示的文件名稱 96 mAttachment.NameEncoding = System.Text.Encoding.UTF8; 97 mAttachment.TransferEncoding = System.Net.Mime.TransferEncoding.Base64; 98 mAttachment.ContentDisposition.Inline = true; 99 mAttachment.ContentDisposition.DispositionType = System.Net.Mime.DispositionTypeNames.Attachment; 100 mMailMessage.Attachments.Add(mAttachment); 101 } 102 } 103 104 mSmtpClient.Send(mMailMessage); 105 return "發送成功!"; 106 107 } 108 catch (Exception ex) 109 { 110 return ex.Message; 111 } 112 } 113 114 public string SendMail(String ServerIP, string UserName, string Password, string FromAddress, string FromAddressName, string Subject, string Body, List<string> ToAddressList) 115 { 116 return SendMail(ServerIP, null, UserName, Password, FromAddress, FromAddressName, Subject, Body, ToAddressList, null, null, false, null, MailPriority.Normal); 117 } 118 } 119 public class AttachmentFile 120 { 121 /// <summary> 122 /// 文件路徑 123 /// </summary> 124 public string FilePath { get; set; } 125 /// <summary> 126 ///附件顯示的文件明 127 /// </summary> 128 public string FileName { get; set; } 129 }

上面的代碼可以直接使用。基本的方法都有，在這兒需要說明下AttachmentFile類是我用于發送文件的時候可以重新命名文件名。

注意：大家在使用的時候注意一下參數UserName和Password，在這兒我以我163的郵箱為例，解釋下這兩個參數的作用。

?

?在使用163郵箱服務器發送信息時需要按照圖片上的操作開啟客戶端授權密碼，上面的UserName和Password就是我們的郵箱地址和授權碼。至于QQ郵箱我有試驗過，但是就是無法發送郵件，至于你們說的開啟POP3和SMTP的選項，我也已經開啟了，如果知道一些原因的話，可以在下面留言告訴我！感激！

希望能幫到大家！

?

轉載于:https://www.cnblogs.com/wujiadexingfu/p/7711527.html

總結

以上是生活随笔為你收集整理的C# 发送email邮件！的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。