MimeKit 给.NET 社区带来了一流的 MIME 解析器，它能处理复杂的各种Mime， 性能好。而且开箱即用支持 S/MIME 和 PGP。MimeKit 和 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。
使用方法很简单和.NET的SmtpClient 差不多，不过比它优雅多了，下面show个代码：
using MimeKit;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
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 = @"
Hey geffzhang
不好意思，我在测试程序，刚才把QQ号写错了，Sorry！
-- Geffzhang
"
};
// 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)
};
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", 587, 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);
}
}
private static void TestSmtpClient()
{
MailMessage mymail = new MailMessage();
mymail.From = new System.Net.Mail.MailAddress(mailFrom);
mymail.To.Add(mailTo);
mymail.Subject = string.Format("C#自动发送邮件测试 From geffzhang TO {0}",mailTo);
mymail.Body = @"
Hey geffzhang
不好意思，我在测试程序，刚才把QQ号写错了，Sorry！
-- Geffzhang
";
mymail.IsBodyHtml = true;
mymail.Attachments.Add(new Attachment(path));
System.Net.Mail.SmtpClient smtpclient = new System.Net.Mail.SmtpClient();
smtpclient.Port = 587;
smtpclient.UseDefaultCredentials = false;
smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpclient.Host = "smtp.live.com";
smtpclient.EnableSsl = true;
smtpclient.Credentials = new System.Net.NetworkCredential(mailFromAccount, mailPassword);
try
{
smtpclient.Send(mymail);
Console.WriteLine("发送成功");
}
catch (Exception ex)
{
Console.WriteLine("发送邮件失败.请检查是否为qq邮箱，并且没有被防护软件拦截" + ex);
}
}
}
}
上面代码是smtp发送代码，这个库还支持POP3, 和 IMAP 等。
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