.NET使用MailKit进行邮件处理的方法步骤

爱被打了一巴掌 2022-10-15 10:47 47阅读 0赞

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  
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client.Connect("imap.exmail.qq.com", 993, SecureSocketOptions.SslOnConnect);  
不加密  
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client.Connect("imap.exmail.qq.com", 143, SecureSocketOptions.None);  
登入邮箱  
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client.Authenticate(MAIL\_NAME, MAIL\_PASSWORD);  
打开邮件文件夹  
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client.Inbox.Open(FolderAccess.ReadWrite);  
读取文件  
读取方式一：可以预先筛选邮件  
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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  
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var uids = client.Inbox.Search(SearchQuery.All);  
邮件操作

操作邮件一：读取邮件标题  
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string subject = message.Subject;  
if (!subject.Contains("MimeKitDemo"))  
return;  
操作邮件二：读取正文  
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string body = message.TextBody ?? string.Empty;  
if (!body.Contains("MimeKitDemoBody"))  
return;  
操作邮件三：下载邮件附件  
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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）  
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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  
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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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