通过Aspose.Email包，可以方便地对邮件文件进行处理，如：读取邮件信息、获取内嵌HTML等

Aspose.Email - 处理MIME Email文件

1 example

以Microsoft Outlook 2013邮件文件格式(*.msg)为例，邮件Body是一个内嵌的HTML页面。

using System;
using Aspose.Email;
using System.IO;

namespace EmailTest
{
    class EmailTest
    {
        static void Main(string[] args)
        {
            // Create MailMessage instance by loading an Eml file
            MailMessage message = MailMessage.Load(@"C:\Dev\Mail\Mail.msg");

            // Print From, To(es), CC(s)
            Console.WriteLine("From: " + message.From.DisplayName + "<" + message.From.Address + ">");
            foreach(var toAddr in message.To)
            {
                Console.WriteLine("To: " + toAddr.DisplayName + "<" +  toAddr.Address + ">");
            }
            foreach (var ccAddr in message.CC)
            {
                Console.WriteLine("CC: " + ccAddr.DisplayName + "<" + ccAddr.Address + ">");
            }
            // Print Subject and Date(Time)
            Console.WriteLine("Subject: " + message.Subject);
            Console.WriteLine("DateTime: " + message.Date.ToString());
            
            // pause
            Console.ReadKey();

            // Print message body
            Console.WriteLine("Body:");
            if (message.IsBodyHtml)
            {
                Console.WriteLine(message.HtmlBody);

                // Save HTML message body as a page
                FileStream outFile = File.OpenWrite(@"C:\Dev\Mail\MailBody.html");
                StreamWriter writer = new StreamWriter(outFile);
                writer.Write(message.HtmlBody);
                writer.Close();
            }
            else
            {
                Console.WriteLine(message.Body);
            }

            // Print and save mail's attachments
            Console.WriteLine("Attachments:");
            foreach (var attach in message.Attachments)
            {
                Console.WriteLine(attach.Name + attach.ContentType);
                attach.Save(@"C:\Dev\Mail\" + attach.Name);
            }
        }
    }
}