第二部分，公共属性

答案：接上
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/// <summary> 
/// 最多收件人数量 
/// </summary> 
public int RecipientMaxNum 
{ 
    set 
    { 
        recipientmaxnum = value; 
    } 
} 

/// <summary> 
/// 邮件服务器域名和验证信息 
/// 形如："user:pass@www.server.com:25"，也可省略次要信息。如"user:pass@www.server.com"或"www.server.com" 
/// </summary>    
public string MailDomain 
{ 
    set 
    { 
        string maidomain=value.Trim(); 
        int tempint; 

        if(maidomain!="") 
        { 
            tempint=maidomain.IndexOf("@"); 
            if(tempint!=-1) 
            { 
            string str=maidomain.Substring(0,tempint); 
                        MailServerUserName=str.Substring(0,str.IndexOf(":")); 
                        MailServerPassWord=str.Substring(str.IndexOf(":")+1,str.Length-str.IndexOf(":")-1); 
                        maidomain=maidomain.Substring(tempint+1,maidomain.Length-tempint-1); 
            } 
                tempint=maidomain.IndexOf(":"); 
            if(tempint!=-1) 
            { 
                mailserver=maidomain.Substring(0,tempint); 
                        mailserverport=System.Convert.ToInt32(maidomain.Substring(tempint+1,maidomain.Length-tempint-1)); 
                    } 
                    else 
                    { 
                        mailserver=maidomain; 

                    } 

                
                } 

            } 
        } 


        /// <summary> 
        /// 邮件服务器端口号 
        /// </summary>    
        public int MailDomainPort 
        { 
            set 
            { 
                mailserverport=value; 
            } 
        } 


        /// <summary> 
        /// SMTP认证时使用的用户名 
        /// </summary> 
        public string MailServerUserName 
        { 
            set 
            { 
                if(value.Trim()!="") 
                { 
                    username=value.Trim(); 
                    ESmtp=true; 
                } 
                else 
                { 
                    username=""; 
                    ESmtp=false; 
                } 
            } 
        } 


        /// <summary> 
        /// SMTP认证时使用的密码 
        /// </summary> 
        public string MailServerPassWord 
        { 
            set 
            { 
                password=value; 
            } 
        }    


        /// <summary> 
        /// 邮件发送优先级，可设置为"High","Normal","Low"或"1","3","5" 
        /// </summary> 
        public string Priority 
        { 
            set 
            { 
           

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