smtpClient發(fā)郵件錯誤：不允許使用郵箱名稱。 服務(wù)器響應(yīng)為: You are not authorized to send mail, authentication is required

使用smtpClient發(fā)送郵件時，經(jīng)常跑出難以明白的錯誤。其實(shí)主要都和我們申請的免費(fèi)郵箱有關(guān)系。有些郵箱不支持，比如163的以前申請的帳號可以用，新注冊的帳號是發(fā)不了的。
??/**////?<summary>
????///?功能：發(fā)送郵件,返回字符串：“發(fā)送成功”否則返回錯誤代碼。
????///?創(chuàng)建：2007-08-23
????///?</summary>
????///?<param?name="MailTo">MailTo為收信人地址</param>
????///?<param?name="Subject">Subject為標(biāo)題</param>
????///?<param?name="Body">Body為信件內(nèi)容</param>
????///?<param?name="BodyFormat">BodyFormat為信件內(nèi)容格式:0為Text,1為Html</param>
????///?<param?name="Priority">Priority為優(yōu)先級:0為低,1為中,2為高</param>
????///?<param?name="Attachments">Attachment為附件,為null則不發(fā)送</param>
????public?static?string?SendMail(System.Collections.ArrayList?MailTo,?string?Subject,?string?Body,?int?BodyFormat,?int?Priority,?string?Attachments)
????{
????????string?result;

????????SmtpClient?mail?=?new?SmtpClient();
????????//發(fā)送方式
????????mail.DeliveryMethod?=?SmtpDeliveryMethod.Network;
????????//smtp服務(wù)器
????????mail.Host?=?"smtp.sina.com";
????????//用戶名憑證???????????????
????????mail.Credentials?=?new?System.Net.NetworkCredential("mail_user_name",?"mail_user_password");
????????//郵件信息
????????MailMessage?message?=?new?MailMessage();
????????//發(fā)件人
????????message.From?=?new?MailAddress("mail_user_name@sina.com");????
????????//收件人
????????foreach?(object?item?in?MailTo)
????????{
????????????message.To.Add(item.ToString());
????????}
????????//主題
????????message.Subject?=?Subject;
????????//內(nèi)容
????????message.Body?=?Body;
????????//正文編碼
????????message.BodyEncoding?=?System.Text.Encoding.UTF8;
????????//設(shè)置為HTML格式
????????message.IsBodyHtml?=?true;
????????//優(yōu)先級
????????message.Priority?=?MailPriority.High;

????????try
????????{
????????????mail.Send(message);
????????????result?=?"發(fā)送成功";
????????????return?result;
????????}
????????catch?(Exception?e)
????????{
????????????result?=?e.ToString();
????????}
????????return?result;
????}
不同的郵箱，要改的部分主要是“上面代碼中高亮的部分”，有些郵箱地址是要加后綴 “@xxx.com”，而有些郵箱只要用戶名就好了 .

附帶以前2003版的：

????????/**////?<summary>
????????///?發(fā)送郵件
????????///?</summary>
????????///?<param?name="Sender">發(fā)件人郵箱地址</param>
????????///?<param?name="Receiver">收件人郵箱地址</param>
????????///?<param?name="Title">郵件標(biāo)題</param>
????????///?<param?name="Content">郵件內(nèi)容</param>
????????///?<param?name="SmtpServer">郵箱服務(wù)器名稱</param>
????????///?<param?name="Validate">服務(wù)器是否需要驗(yàn)證</param>
????????///?<param?name="UserName">驗(yàn)證用戶名</param>
????????///?<param?name="Password">驗(yàn)證密碼</param>
????????///?<returns>結(jié)果</returns>
????????public?string?SendMail(string?from,string?to,string?title,string?body,string?enclosure,
????????????????????????????????????string?smtpServer,bool?validate,string?userName,string?password)
????????{
????????????MailMessage?mail?=?new?MailMessage();//實(shí)例化MailMessage
????????????mail.From?=?from;?//郵件發(fā)件人
????????????mail.To?=?to;//郵件收件人
????????????mail.Subject?=?title;//郵件標(biāo)題
????????????mail.Body?=?body;?//郵件內(nèi)容
????????????mail.BodyFormat?=?MailFormat.Html;?//郵件文本格式
????????????mail.Priority?=?MailPriority.Normal;//郵件發(fā)送級別
????????????if(enclosure?!=?"")
????????????{
????????????????//添加附件
????????????????MailAttachment?ma?=?new?MailAttachment(enclosure);
????????????????mail.Attachments.Add(ma);
????????????}
????????????//郵件服務(wù)器是否需要驗(yàn)證
????????????if(validate)
????????????{
????????????????if(userName?!=?""?&&?password?!=?"")
????????????????{
????????????????????mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate",?"1");??
????????????????????mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername",?userName);?
????????????????????mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword",?password);?
????????????????}
????????????????else
????????????????{
????????????????????return?"缺少驗(yàn)證用戶名和密碼";
????????????????}
????????????}
????????????try
????????????{
????????????????SmtpMail.SmtpServer?=?smtpServer;//設(shè)置郵件服務(wù)器
????
????????????????//發(fā)送郵件
????????????????SmtpMail.Send(mail);
????????????????return?"郵件發(fā)送成功！";
????????????}
????????????catch
????????????{
????????????????return?"郵件發(fā)送失敗！";
????????????}
????????}

?來源：http://www.cnblogs.com/oiea/archive/2007/11/06/951234.html

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