使用smtpClient发送邮件时

author:oiea From:博客园

使用smtpClient发送邮件时，经常跑出难以明白的错误。其实主要都和我们申请的免费邮箱有关系。有些邮箱不支持，比如163的以前申请的帐号可以用，新注册的帐号是发不了的。

/**//// <summary>

/// 功能：发送邮件,返回字符串：“发送成功”否则返回错误代码。

/// 创建：2007-08-23

/// </summary>

/// <param name="MailTo">MailTo为收信人地址</param>

/// <param name="Subject">Subject为标题</param>

/// <param name="Body">Body为信件内容</param>

/// <param name="BodyFormat">BodyFormat为信件内容格式:0为Text,1为Html</param>

/// <param name="Priority">Priority为优先级:0为低,1为中,2为高</param>

/// <param name="Attachments">Attachment为附件,为null则不发送</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();

//发送方式

mail.DeliveryMethod = SmtpDeliveryMethod.Network;

//smtp服务器

mail.Host = "smtp.sina.com";

//用户名凭证

mail.Credentials = new System.Net.NetworkCredential("mail_user_name", "mail_user_password");

//邮件信息

MailMessage message = new MailMessage();

//发件人

message.From = new MailAddress("mail_user_name@sina.com");

//收件人

foreach (object item in MailTo)

{

message.To.Add(item.ToString());

}

//主题

message.Subject = Subject;

//内容

message.Body = Body;

//正文编码

message.BodyEncoding = System.Text.Encoding.UTF8;

//设置为HTML格式

message.IsBodyHtml = true;

//优先级

message.Priority = MailPriority.High;

try

{

mail.Send(message);

result = "发送成功";

return result;

}

catch (Exception e)

{

result = e.ToString();

}

return result;

}

不同的邮箱，要改的部分主要是“上面代码中高亮的部分”，有些邮箱地址是要加后缀“@xxx.com”，而有些邮箱只要用户名就好了 .

附带以前2003版的：

/**//// <summary>

/// 发送邮件

/// </summary>

/// <param name="Sender">发件人邮箱地址</param>

/// <param name="Receiver">收件人邮箱地址</param>

/// <param name="Title">邮件标题</param>

/// <param name="Content">邮件内容</param>

/// <param name="SmtpServer">邮箱服务器名称</param>

/// <param name="Validate">服务器是否需要验证</param>

/// <param name="UserName">验证用户名</param>

/// <param name="Password">验证密码</param>

/// <returns>结果</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();//实例化MailMessage

mail.From = from; //邮件发件人

mail.To = to;//邮件收件人

mail.Subject = title;//邮件标题

mail.Body = body; //邮件内容

mail.BodyFormat = MailFormat.Html; //邮件文本格式

mail.Priority = MailPriority.Normal;//邮件发送级别

if(enclosure != "")

{

//添加附件

MailAttachment ma = new MailAttachment(enclosure);

mail.Attachments.Add(ma);

}

//邮件服务器是否需要验证

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 "缺少验证用户名和密码";

}

}

try

{

SmtpMail.SmtpServer = smtpServer;//设置邮件服务器

//发送邮件

SmtpMail.Send(mail);

return "邮件发送成功！";

}

catch

{

return "邮件发送失败！";

}

}