C#实现邮件的发送和接收smtp发送+pop3接收

已经封装好接收和发送的类，接收邮件的指令也已经封装好，可以直接使用。不过还有一个问题需要在使用时解决，就是有写情况下接收到的中文邮件内容乱码

using System.Net.Mime;

namespace EmailHelp
{
    public static class MediaTypes
    {
        public static readonly string Multipart;

        public static readonly string Mixed;

        public static readonly string Alternative;

        public static readonly string MultipartMixed;

        public static readonly string MultipartAlternative;

        public static readonly string TextPlain;

        public static readonly string TextHtml;

        public static readonly string TextRich;

        public static readonly string Textxml;

        public static readonly string Message;

        public static readonly string Rfc822;

        public static readonly string MessageRfc822;

        public static readonly string Application;

        static Media

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2016-04-14 09:38  Core.Email\
     目录           0  2014-09-19 22:16  Core.Email\bin\
     目录           0  2016-04-14 09:38  Core.Email\bin\Debug\
     文件       58880  2016-04-14 10:06  Core.Email\bin\Debug\Core.Email.dll
     文件      232960  2016-04-14 10:06  Core.Email\bin\Debug\Core.Email.pdb
     目录           0  2014-09-20 10:07  Core.Email\bin\Release\
     文件        3878  2014-09-20 11:27  Core.Email\Core.Email.csproj
     目录           0  2016-04-14 09:38  Core.Email\Mime\
     文件        1444  2014-09-19 22:16  Core.Email\Mime\MediaTypes.cs
     文件       17905  2014-09-19 22:16  Core.Email\Mime\MimeEntity.cs
     文件         496  2014-09-19 22:16  Core.Email\Mime\MimeHeaders.cs
     文件       14212  2016-04-14 10:06  Core.Email\Mime\MimeReader.cs
     文件        2337  2014-09-19 22:16  Core.Email\Mime\QuotedPrintableEncoding.cs
     目录           0  2014-09-19 22:16  Core.Email\obj\
     目录           0  2016-04-14 10:06  Core.Email\obj\Debug\
     文件        1248  2016-04-14 09:38  Core.Email\obj\Debug\Core.Email.csproj.FileListAbsolute.txt
     文件       58880  2016-04-14 10:06  Core.Email\obj\Debug\Core.Email.dll
     文件      232960  2016-04-14 10:06  Core.Email\obj\Debug\Core.Email.pdb
     文件        5495  2016-04-14 10:06  Core.Email\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     目录           0  2014-09-19 22:16  Core.Email\obj\Debug\TempPE\
     目录           0  2016-04-14 09:38  Core.Email\Properties\
     文件        1370  2014-09-19 22:16  Core.Email\Properties\AssemblyInfo.cs
     目录           0  2016-04-14 09:38  Core.Email\邮件\
     目录           0  2016-04-14 09:38  Core.Email\邮件2\
     文件        4800  2014-09-19 22:16  Core.Email\邮件2\ConnectCommand.cs
     文件         701  2014-09-19 22:16  Core.Email\邮件2\ConnectResponse.cs
     文件        1258  2014-09-19 22:16  Core.Email\邮件2\DeleCommand.cs
     文件        3585  2014-09-19 22:16  Core.Email\邮件2\ListCommand.cs
     文件        1692  2014-09-19 22:16  Core.Email\邮件2\ListResponse.cs
     文件         635  2014-09-19 22:16  Core.Email\邮件2\MailHeaders.cs
     文件        9646  2014-09-19 22:16  Core.Email\邮件2\MailMessageEx.cs
............此处省略23个文件信息