System.Net.Mail.SmtpClient 发送邮件

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Mail;

namespace WebInfo_Target.Core.Extends
...{
    public class Email
    ...{
        /**//// <summary>
        /// smtp服务是否需要帐号验证
        /// </summary>
        public static bool IsUserCredentials
        ...{
            get
            ...{
                string tmp = SysConfig.getConfig("SmtpClientIsUserCredentials");
                return "true".Equals(tmp);
            }
        }
        /**//// <summary>
        /// smtp服务是否允许非登陆帐号发送邮件
        /// </summary>
        public static bool IsOnlyForLocUser
        ...{
            get
            ...{
                string tmp = SysConfig.getConfig("SmtpClientIsOnlyForLocUser");
                return "true".Equals(tmp);
            }
        }
        /**//// <summary>
        /// smtp帐号
        /// </summary>
        public static string Account
        ...{
            get ...{ return SysConfig.getConfig("SmtpClientCredentialAccount"); }
        }
        /**//// <summary>
        /// 身份认证
        /// </summary>
        public static NetworkCredential Credential
        ...{
            get
            ...{
                string password = SysConfig.getConfig("SmtpClientCredentialPassword");
                return new NetworkCredential(Account, password);
            }
        }
        /**//// <summary>
        /// smtp主机地址
        /// </summary>
        public static string Host
        ...{
            get
            ...{
                return SysConfig.getConfig("SmtpClientHost");
            }
        }
        /**//// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="from">发件人</param>
        /// <param name="to">收件人</param>
        /// <param name="title">标题/主题</param>
        /// <param name="content">信件内容</param>
        public static void SendMail(string from, string to, string title, string content)
        ...{
            SmtpClient smtp = new SmtpClient(Host);
            if (IsUserCredentials)
            ...{
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = Credential;
            }
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            if (IsOnlyForLocUser)
            ...{
                from = Account;
            }
            MailMessage msg = new MailMessage(from, to, title, content);
            msg.BodyEncoding = Encoding.GetEncoding(936);
            msg.SubjectEncoding = Encoding.GetEncoding(936);
            smtp.Send(msg);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace WebInfo_Target.Core
...{
    /**//// <summary>
    /// 系统配置类
    /// </summary>
    public class SysConfig
    ...{
        /**//// <summary>
        /// 读取配置数据, 返回参数指定的[appSettings]节点的属性值
        /// </summary>
        /// <param name="key">属性名称</param>
        /// <returns>配置的值</returns>
        public static string getConfig(string key)
        ...{
            return System.Configuration.ConfigurationManager.AppSettings[key];
        }
    }
}

Web.config

<?xml version="1.0"?>
<configuration>
    <appSettings>
        <add key="SmtpClientHost" value="mail.doit.name"/>
                <add key="SmtpClientIsUserCredentials" value="true"/>
                <add key="SmtpClientIsOnlyForLocUser" value="true"/>
                <add key="SmtpClientCredentialAccount" value="dany-zj@126.com"/>
                <add key="SmtpClientCredentialPassword" value="abcdefg"/>
    </appSettings>
</configuration>