.NET使用MailKit進行郵件處理的方法步驟

0.介紹

MimeKit and MailKit are popular fully-featured email frameworks for .NET

框架支持版本如下

Supports .NET 4.5, .NET 4.6, .NET 4.7, .NET 4.8, .NET 5.0, .NETStandard 2.0, Xamarin.Android, Xamarin.iOS, Windows Phone 8.1, and more.

MailKit是最流行且最強大的.NET郵件處理框架之一,下面為大傢簡單介紹MailKit的使用方式(IMAP為例)

1. 參考資料

Github https://github.com/jstedfast/MailKit

官方Doc http://www.mimekit.net/docs/html/Introduction.htm

2.核心內容(IMAP為例)

連接郵箱

加密

client.Connect("imap.exmail.qq.com", 993, SecureSocketOptions.SslOnConnect);

不加密

client.Connect("imap.exmail.qq.com", 143, SecureSocketOptions.None);

登入郵箱

client.Authenticate(MAIL_NAME, MAIL_PASSWORD);

打開郵件文件夾

client.Inbox.Open(FolderAccess.ReadWrite);

讀取文件

讀取方式一:可以預先篩選郵件

search for messages where the Subject header contains either "MimeKit" or "MailKit"
  var query = SearchQuery.SubjectContains("MimeKit").Or(SearchQuery.SubjectContains("MailKit"));
  var uids = client.Inbox.Search(query);

讀取方式二:讀取所有郵件

var uids = client.Inbox.Search(SearchQuery.All);

郵件操作

操作郵件一:讀取郵件標題

string subject = message.Subject;
  if (!subject.Contains("MimeKitDemo"))
    return;

操作郵件二:讀取正文

string body = message.TextBody ?? string.Empty;
  if (!body.Contains("MimeKitDemoBody"))
    return;

操作郵件三:下載郵件附件

var attachments = message.Attachments;
  if (attachments.Any())
  {
    foreach (var attachment in attachments)
      DownloadAttachment(attachment);
  }

  private static void DownloadAttachment(MimeEntity attachment)
  {
    if (attachment is MessagePart)
    {
      var fileName = attachment.ContentDisposition?.FileName;
      var rfc822 = (MessagePart)attachment;

      if (string.IsNullOrEmpty(fileName))
        fileName = "attached-message.eml";

      var path = Path.Combine(DIRECTORY, fileName);
      using (var stream = File.Create(path))
        rfc822.Message.WriteTo(stream);
    }
    else
    {
      var part = (MimePart)attachment;
      var fileName = part.FileName;

      var path = Path.Combine(DIRECTORY, fileName);
      using (var stream = File.Create(path))
        part.Content.DecodeTo(stream);
    }
  }

操作郵件四:移動郵件(移動至刪除文件夾)

client.Inbox.MoveTo(uid, client.GetFolder(SpecialFolder.Trash));

操作郵件五:刪除郵件 – 將郵件標記為刪除、最後刪除

client.Inbox.AddFlags(uid, MessageFlags.Deleted, true);
  client.Inbox.Expunge();

3.樣例源碼地址

https://github.com/Impartsoft/Bins/tree/main/MailKitDemo

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