.NET使用MailKit進行郵件處理

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，下面為大家簡單介紹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）

加密

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

不加密

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

client.Authenticate(MAIL_NAME, MAIL_PASSWORD);

client.Inbox.Open(FolderAccess.ReadWrite);

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);

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

歡迎大家批評指正，共同學習，共同進步！
作者：Iannnnnnnnnnnnn

出處：https://www.cnblogs.com/Iannnnnnnnnnnnn

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