MailKit/MimeKit 发送邮件

MimeKit / MailKit 支持最新的国际化的电子邮件标准，是.NET 中为一个支持完整支持这些标准电子邮件库，最近正式发布了1.0版本。如果你想做所有与的电子邮件相关的事情，看看 MimeKit 和 MailKit。我保证你不会失望，它支持.NET/Mono的所有平台，包括移动电话、平板等.

废话不多说,直接上代码:

using MimeKit;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MailKit.Net.Smtp;
using System.IO;

namespace NetSmtpClient
{
    class Program
    {
        const string mailFrom = "xxxx@hotmail.com";
        const string mailTo = "xxxx@qq.com";
        const string mailFromAccount = "xxxx@hotmail.com";
        const string mailPassword = "xxxx";
        const string path = @"E:\GitHub\TestMailClient\NetSmtpClient\.NETFoundation.png";
        static void Main(string[] args)
        {
            TestSmtpClient();

            TestMailKit();

        }

        private static void TestMailKit()
        {
            var message = new MimeMessage();
            message.From.Add(new MailboxAddress("geffzhang", mailFrom));
            message.To.Add(new MailboxAddress("geffzhang", mailTo));
            message.Subject = string.Format("C#自动发送邮件测试 From geffzhang TO {0}", mailTo);

            var plain = new TextPart("plain")
            {
                Text = @"不好意思，我在测试程序，刚才把QQ号写错了，Sorry！"
            };
            var html = new TextPart("html")
            {
                Text = @"<p>Hey geffzhang<br>
<p>不好意思，我在测试程序，刚才把QQ号写错了，Sorry！<br>
<p>-- Geffzhang<br>"
            };
            // create an image attachment for the file located at path
            var attachment = new MimePart("image", "png")
            {
                ContentObject = new ContentObject(File.OpenRead(path), ContentEncoding.Default),
                ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                ContentTransferEncoding = ContentEncoding.Base64,
                FileName = Path.GetFileName(path)
            };

           attachment.ContentType.Parameters.Add("GB18030", "name", fileName);
           attachment.ContentDisposition.Parameters.Add("GB18030", "filename", fileName)var alternative = new Multipart("alternative"); alternative.Add(plain); 

alternative.Add(html); 
// now create the multipart/mixed container to hold the message text and the 
// image attachment 
var multipart = new Multipart("mixed"); 
multipart.Add(alternative); multipart.Add(attachment); 
message.Body = multipart; 
using (var client = new MailKit.Net.Smtp.SmtpClient()) 
{ 
　　client.Connect("smtp.live.com", , false); 
// Note: since we don't have an OAuth2 token, disable 
// the XOAUTH2 authentication mechanism. 
client.AuthenticationMechanisms.Remove("XOAUTH2"); 
// Note: only needed if the SMTP server requires authentication  
client.Authenticate(mailFromAccount, mailPassword); client.Send(message); client.Disconnect(true); 
} 
} 
} 
}

上面代码是smtp发送代码，这个库还支持POP3, 和 IMAP 等。