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", 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); 
} 
} 
} 
}

上面代码是smtp发送代码，这个库还支持pop3, 和 imap 等。