.NET使用MailKit进行邮件处理的方法步骤

0.介绍

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是最流行且最强大的.NET邮件处理框架之一，下面为大家简单介绍MailKit的使用方式（IMAP为例）

1. 参考资料

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

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

2.核心内容（IMAP为例）

连接邮箱

加密

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

不加密

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

登入邮箱

client.Authenticate(MAIL_NAME, MAIL_PASSWORD);

打开邮件文件夹

client.Inbox.Open(FolderAccess.ReadWrite);

读取文件

读取方式一：可以预先筛选邮件

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);

读取方式二：读取所有邮件

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

邮件操作

操作邮件一：读取邮件标题

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

操作邮件二：读取正文

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

操作邮件三：下载邮件附件

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);
    }
  }

操作邮件四：移动邮件（移动至删除文件夹）

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

操作邮件五：删除邮件 - 将邮件标记为删除、最后删除

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

3.样例源码地址

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

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