.NET下发送邮件

using System;using System.Web.Mail;namespace YywMail{    public abstract class MySmtpMail    {        Fields#region Fields        private string _defaultCharset = "GB2312";        private int _defaultSmtpPort = 25;

        #endregion               Properties#region Properties

        protected string DefaultCharset        {            get { return this._defaultCharset; }        }

        protected int DefaultSmtpPort        {            get { return this._defaultSmtpPort;}        }

        #endregion

        Methods#region Methods

        /** <summary>        /// 获取默认实例        /// </summary>        /// <returns></returns>        public static MySmtpMail GetDefaultInstance()        {            // 此处可通过外部配置文件定义具体实现类型,再            // 通过 Activator.CreateInstance() 获取类型实例                    }

        /** <summary>        /// 做一些初始化的工作        /// </summary>        public abstract void Open();

        /** <summary>        /// 销毁对象        /// </summary>        public abstract void Close();

        /** <summary>        /// 发送邮件        /// </summary>        /// <param name="message"></param>        /// <param name="smtpServer"></param>        /// <param name="serverUsername"></param>        /// <param name="serverPassword"></param>        /// <returns></returns>        public bool Send(MailMessage message, string smtpServer, string serverUsername, string serverPassword)        {            return Send(message, smtpServer, serverUsername, serverPassword, this._defaultSmtpPort);        }

        public abstract bool Send(MailMessage message, string smtpServer, string serverUsername, string serverPassword, int smtpPort);

        public static string[] GetTo(MailMessage message)        {            if (message == null)                throw new ArgumentNullException("message");

            if (Globals.IsNullorEmpty(message.To))                return null;

            return message.To.Split(';');        }

        public static string[] GetCc(MailMessage message)        {            if (message == null)                throw new ArgumentNullException("message");

            if (Globals.IsNullorEmpty(message.Cc))                return null;

            return message.Cc.Split(';');        }

        public static string[] GetBcc(MailMessage message)        {            if (message == null)                throw new ArgumentNullException("message");

            if (Globals.IsNullorEmpty(message.Bcc))                return null;

            return message.Bcc.Split(';');        }

        #endregion    }}

注: 按照常理，使用前先 Open() 一下，使用后也别忘了 Close()

实现方案一（Jmail 组件）：

在 .NET 中使用 Jmail  需要如下设置：1、安装jmail；2、找到jmail.dll；3、注册该组件Jmail.dll，作法是将jmail.dll文件拷贝到system32目录下，再运行命令“regsvr32 jmail.dll”（不包括引号），卸载可运行“regsvr32 /u jmail.dll”；4、执行Program Files/Microsoft Visual Studio .NET/FrameworkSDK/Bin/ildasm.exe（可使用Visual Studio .Net 2003 命令提示),格式如下：tlbimp c:/Program Files/Dimac/w3JMail4/jmail.dll /out:MyJmail.dll /namespace:MyJmail生成MyJmail.dll后，将它引用至项目中。

下载组件

接下来就是实现类的编写了：

using System;using System.Web.Mail;

namespace YywMail{    public class JMailSmtpMail : MySmtpMail    {        Fields#region Fields

        MyJmail.Message jmail = null;

        #endregion

        Methods#region Methods

        public override void Open()        {            jmail = new MyJmail.Message();        }

        public override bool Send(MailMessage message, string smtpServer, string serverUsername, string serverPassword, int smtpPort)        {            if (jmail == null)                throw new Exception("smtp is Closed!");                        if (message == null)                throw new ArgumentNullException("message");

            DateTime t = DateTime.Now;

            //Silent属性：如果设置为true,JMail不会抛出例外错误. JMail. Send( () 会根据操作结果返回true或false            jmail.Silent = false;

            //jmail创建的日志，前提loging属性设置为true            jmail.Logging = true;

            //字符集，缺省为"US-ASCII"            jmail.Charset = base.DefaultCharset;

            //信件的contentype. 缺省是"text/plain"） : 字符串如果你以HTML格式发送邮件, 改为"text/html"即可。            if (message.BodyFormat == MailFormat.Html)                jmail.ContentType = "text/html";

                        jmail.Priority = GetJmailPriority(message.Priority);

            //添加收件人            string[] toArray = MySmtpMail.GetTo(message);            if (toArray != null && toArray.Length > 0)            {                bool isAddedRecipient = false;

                for (int i = 0; i < toArray.Length; i++)                {                    if (Globals.IsNullorEmpty(toArray[i]))                        continue;

                    if (!isAddedRecipient)                    {                        jmail.AddRecipient(toArray[i], String.Empty, String.Empty);                        isAddedRecipient = true;                    }                    else                    {                        jmail.AddRecipientCC(toArray[i], String.Empty, String.Empty);                    }                }            }

            string[] ccArray = MySmtpMail.GetCc(message);            if (ccArray != null)            {                foreach (string cc in ccArray)                {                    if (!Globals.IsNullorEmpty(cc))                        jmail.AddRecipientCC(cc, String.Empty, String.Empty);                }            }

            string[] bccArray = MySmtpMail.GetBcc(message);            if (ccArray != null)            {                foreach (string bcc in bccArray)                {                    if (!Globals.IsNullorEmpty(bcc))                        jmail.AddRecipientBCC(bcc, String.Empty);                }            }

            jmail.From = message.From;           

            //发件人邮件用户名            jmail.MailServerUserName = serverUsername;            //发件人邮件密码            jmail.MailServerPassWord = serverPassword;                        //设置邮件标题            jmail.Subject = message.Subject;            //邮件添加附件,(多附件的话，可以再加一条jmail.AddAttachment( "c://test.jpg",true,null);)就可以搞定了。［注］：加了附件，讲把上面的jmail.ContentType="text/html";删掉。否则会在邮件里出现乱码。            //jmail.AddAttachment("c://test.jpg", true, null);            //邮件内容            jmail.Body = message.Body;

            if (message.BodyFormat == MailFormat.Html)                jmail.Body += "<br><br>";             else                jmail.Body += "/r/n/r/n";

            jmail.Body += DateTime.Now.ToString();

            smtpServer = String.Format("{0}:{1}", smtpServer, smtpPort);

            //jmail发送的方法            bool result = jmail.Send(smtpServer, false);

            return result;        }

        public override void Close()        {            jmail.Close();        }

        private static byte GetJmailPriority( System.Web.Mail.MailPriority priority)        {            // 邮件等级，1为加急，3为普通，5为低级

            if (priority == System.Web.Mail.MailPriority.High)                return 1;

            if (priority == System.Web.Mail.MailPriority.Low)                return 5;

            return 3;        }

        #endregion    }}

 

实现方案二（OpenSmtp.Net 组件）：

对于还没有接触过 OpenSmtp.Net 的朋友可以先 Google 下，这里不再做概念介绍，同时它还有一个孪生兄弟 OpenPop.Net，至于 OpenSmtp.Net 我们可以在 http://sourceforge.net/projects/opensmtp-net/ 下载到，目前最新版本是 1.11。

接下来开始进入主题：

using System;using System.Web.Mail;using OpenSmtp.Mail;

namespace YywMail{    public class OpenSmtpMail : MySmtpMail    {        Files#region Files

        OpenSmtp.Mail.MailMessage msg = null;        Smtp smtp = null;

        #endregion

        Methods#region Methods

        public override void Open()        {            msg = new OpenSmtp.Mail.MailMessage();            smtp = new Smtp();        }

        public override bool Send(System.Web.Mail.MailMessage message, string smtpServer, string serverUsername, string serverPassword, int smtpPort)        {            if (msg == null || smtp == null)                throw new Exception("smtp is Closed!");

            if (message == null)                throw new ArgumentNullException("message");

            SmtpConfig.VerifyAddresses = false;            EmailAddress from = new EmailAddress(message.From, message.From);                        msg.Charset = base.DefaultCharset;

            msg.From = from;            msg.Priority = GetOpenSmtpPriority(message.Priority);

            //添加收件人            string[] toArray = MySmtpMail.GetTo(message);            if (toArray != null)            {                foreach (string to in toArray)                {                    if (!Globals.IsNullorEmpty(to))                        msg.AddRecipient(to, AddressType.To);                }            }

            string[] ccArray = MySmtpMail.GetCc(message);            if (ccArray != null)            {                foreach (string cc in ccArray)                {                    if (!Globals.IsNullorEmpty(cc))                        msg.AddRecipient(cc, AddressType.Cc);                }            }

            string[] bccArray = MySmtpMail.GetBcc(message);            if (ccArray != null)            {                foreach (string bcc in bccArray)                {                    if (!Globals.IsNullorEmpty(bcc))                        msg.AddRecipient(bcc, AddressType.Bcc);                }            }

            msg.Subject = message.Subject;

            if (message.BodyFormat == System.Web.Mail.MailFormat.Html)            {                msg.HtmlBody = message.Body + "<br><br>" + DateTime.Now.ToString();            }            else            {                msg.Body = message.Body + "/r/n/r/n" + DateTime.Now.ToString();;            }

            string str1 = msg.HtmlBody;            string str2 = msg.Body;                        smtp.Host = smtpServer;            smtp.Username = serverUsername;            smtp.Password = serverPassword;            smtp.Port = smtpPort;

            smtp.SendMail(msg);

            return true;        }                public override void Close()        {            msg = null;            smtp = null;        }

        private static string GetOpenSmtpPriority( System.Web.Mail.MailPriority priority)        {            // 邮件等级，1为加急，3为普通，5为低级

            if (priority == System.Web.Mail.MailPriority.High)                return OpenSmtp.Mail.MailPriority.High;

            if (priority == System.Web.Mail.MailPriority.Low)                return OpenSmtp.Mail.MailPriority.Low;

            return OpenSmtp.Mail.MailPriority.Normal;        }

        #endregion    }}

实现方案三：

（上面两种实现方案已经足够满足目前的需求，有必要的话再继续扩展）