我相信每一个系统，都会有邮件发送的场景，而且这种使用场景有很多，比如登入一个系统，忘记密码，那就要通过忘记密码功能，检查你注册邮件，然后发一封重设密码的邮件给你（当然现在可能通过手机验证码处理的方案多）。
到今天为止我一直以为，.NET发送邮件组件有很多，我之前了解的有.Net 自带的System.Net.Mail，JMail，MimeKit&MailKit。
今天我用度娘搜索了一下“发送邮件 组件”，搜索结果大概汇总一下，.Net 自带的，CDO 组件，JMail 组件 就这三个。没有搜索到 MimeKit&MailKit，
但是单独搜“MailKit”能够搜索到，而且是大牛 张善友 写的，那我暂时先说一下 MimeKit&MailKit吧。
友情推荐一下 张善友 http://www.cnblogs.com/shanyou/p/4034298.html
MimeKit&MailKit 外国开源邮件发送组件，其实是由两个组件组成
MimeKit 负责处理寄件者，消息，附件 等等内容相关的。
MimeKit 官网：http://www.mimekit.net/
MimeKit GitHub https://github.com/jstedfast/MimeKit
开发指南：http://www.mimekit.net/docs/html/Introduction.htm
MailKit 负责发送相关的。
MailKit GitHub：https://github.com/jstedfast/MailKit
贴几段代码让大家感受一下
MimeKit 部分
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";
message.Body = new TextPart ("plain") {
Text = @"Hey Alice,
What are you up to this weekend? Monica is throwing one of her parties on
Saturday and I was hoping you could make it.
Will you be my +1?
-- Joey
"
};
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";
// create our message text, just like before (except don't set it as the message.Body)
var body = new TextPart ("plain") {
Text = @"Hey Alice,
What are you up to this weekend? Monica is throwing one of her parties on
Saturday and I was hoping you could make it.
Will you be my +1?
-- Joey
"
};
// create an image attachment for the file located at path
var attachment = new MimePart ("image", "gif") {
ContentObject = new ContentObject (File.OpenRead (path), ContentEncoding.Default),
ContentDisposition = new ContentDisposition (ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
FileName = Path.GetFileName (path)
};
// now create the multipart/mixed container to hold the message text and the
// image attachment
var multipart = new Multipart ("mixed");
multipart.Add (body);
multipart.Add (attachment);
// now set the multipart/mixed as the message body
message.Body = multipart;
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";
var builder = new BodyBuilder ();
// Set the plain-text version of the message text
builder.TextBody = @"Hey Alice,
What are you up to this weekend? Monica is throwing one of her parties on
Saturday and I was hoping you could make it.
Will you be my +1?
-- Joey
";
// In order to reference sexy-pose.jpg from the html text, we'll need to add it
// to builder.LinkedResources and then use its Content-Id value in the img src.
var image = builder.LinkedResources.Add (@"C:UsersJoeyDocumentsSelfiessexy-pose.jpg");
image.ContentId = MimeUtils.GenerateMessageId ();
// Set the html version of the message text
builder.HtmlBody = string.Format (@"<p>Hey Alice,<br>
<p>What are you up to this weekend? Monica is throwing one of her parties on
Saturday and I was hoping you could make it.<br>
<p>Will you be my +1?<br>
<p>-- Joey<br>
<center><img src=""cid:{0}""></center>", image.ContentId);
// We may also want to attach a calendar event for Monica's party...
builder.Attachments.Add (@"C:UsersJoeyDocumentsparty.ics");
// Now we just need to set the message body and we're done
message.Body = builder.ToMessageBody ();
怎么样？是不是感觉老外写得东西，比较好看，易懂啊。
MailKit 部分
using System;
using MailKit.Net.Smtp;
using MailKit;
using MimeKit;
namespace TestClient {
class Program
{
public static void Main (string[] args)
{
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey Tribbiani", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Mrs. Chanandler Bong", "chandler@friends.com"));
message.Subject = "How you doin'?";
message.Body = new TextPart ("plain") {
Text = @"Hey Chandler,
I just wanted to let you know that Monica and I were going to go play some paintball, you in?
-- Joey"
};
using (var client = new SmtpClient ()) {
client.Connect ("smtp.friends.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 ("joey", "password");
client.Send (message);
client.Disconnect (true);
}
}
}
}
这个是不是感觉跟.Net 发送邮件部分差不多啊！
下面是我封装的.Net 发送邮件部分代码，做个对比
public class Mail
{
private static SystemMailHostConfig _config;
public static Mail SystemMail
{
get { return new Mail(); }
}
public Mail()
{
_config = new SystemMailHostConfig
{
FromName = MailConfig.SystemMailFromName,
From = MailConfig.SystemMailFrom,
MailHostConfig = new MailHostConfig
{
HostName = MailConfig.SmtpHostName,
Account = MailConfig.MailAccount,
Password = MailConfig.MailPassword
}
};
}
public Mail(SystemMailHostConfig config)
{
_config = config;
}
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="context"></param>
/// <param name="message">默认为null。 System.Net.Mail.MailMessage </param>
public void Send(MailContext context, MailMessage message = null)
{
//ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult;
var sender = new SmtpClient();
message = message ?? new MailMessage();
if (context.Receivers.IsNotNullOrEmpty())
{
message.To.AddRange(context.Receivers.ToArray());
}
if (context.Ccs.IsNotNullOrEmpty())
{
message.CC.AddRange(context.Ccs.ToArray());
}
if (context.Bccs.IsNotNullOrEmpty())
{
message.Bcc.AddRange(context.Bccs.ToArray());
}
message.Subject = context.Subject;
message.Body = context.Body;
if (context.Attachments.IsNotNullOrEmpty())
{
message.Attachments.AddRange(context.Attachments.ToArray());
}
message.IsBodyHtml = true;
try
{
message.From = new MailAddress(_config.From, _config.FromName);
sender.Port = 2620;
sender.Host = _config.MailHostConfig.HostName;
sender.UseDefaultCredentials = false;
sender.Credentials = new NetworkCredential(_config.MailHostConfig.Account, _config.MailHostConfig.Password);
sender.DeliveryMethod = SmtpDeliveryMethod.Network;
sender.EnableSsl = true;
sender.Send(message);
}
catch
{
_config = new SystemMailHostConfig
{
FromName = MailConfig.StandbySystemMailFromName,
From = MailConfig.StandbySystemMailFrom,
MailHostConfig = new MailHostConfig
{
HostName = MailConfig.StandbySmtpHostName,
Account = MailConfig.StandbyMailAccount,
Password = MailConfig.StandbyMailPassword
}
};
message.From = new MailAddress(_config.From, _config.FromName);
sender.Port = 587;
sender.Host = _config.MailHostConfig.HostName;
sender.UseDefaultCredentials = false;
sender.Credentials = new NetworkCredential(_config.MailHostConfig.Account, _config.MailHostConfig.Password);
sender.DeliveryMethod = SmtpDeliveryMethod.Network;
sender.EnableSsl = true;
sender.Send(message);
}
}
}
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，且它还支持.NET/Mono的所有平台，包括移动电话、平板等，希望大家在架构多一种方案，多一种选择。