C# 邮件发送(三种)

private bool SendMailTest()
{
bool blnFlag = false;
/*
* mail发送方法：不需指定用户名和密码
*/
/*
* 方法一
*
* 可写为：
SmtpClient client = new SmtpClient();
client.Host = "host";
*/
SmtpClient client = new SmtpClient("host", 25);
client.UseDefaultCredentials = false;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
/*
* message也可以写为如下：
*
MailMessage message = new MailMessage();
message.From = new MailAddress("mailAddress", "name");
message.To.Add(new MailAddress("mailAddress", "name"));
*/
MailMessage message = new MailMessage(new MailAddress("mailAddress", "name"),
new MailAddress("mailAddress", "name"));
message.Subject = "TestSubject";
message.Body = "TestBody";
message.IsBodyHtml = true;
message.Priority = MailPriority.High;
try
{
client.Send(message);
blnFlag = true;
}
catch (Exception ex)
{
throw ex;
}
return blnFlag;
}

private static bool SendMail()
{
bool strRe = false;
//host为所使用发送邮箱的服务器
SmtpClient client = new SmtpClient("host", 25);//txtStmp.Text
client.UseDefaultCredentials = false;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
/*为发件人的邮箱名和密码；
如邮箱为123456@163.com
用户名为123456
密码当然你发件人邮箱的密码
*/
client.Credentials = new NetworkCredential("userName", "password");
MailMessage SendMes = new MailMessage(new MailAddress("fromMailAddress"),
new MailAddress("toMailAddress"));
//邮件主题
SendMes.Subject = "textSubject";
//主题编码
SendMes.SubjectEncoding = Encoding.UTF8;
//邮件正文
SendMes.Body = "textBody";
//正文编码
SendMes.BodyEncoding = Encoding.UTF8;
//设置为HTML格式
SendMes.IsBodyHtml = true;
//优先级
SendMes.Priority = MailPriority.High;
try
{
client.Send(SendMes);
strRe = true;
}
catch (Exception ex)
{
throw ex;
}
return strRe;
}

private bool SendMailTest1()
{
bool blnFlag = false;
SmtpClient client = new SmtpClient();
client.Host = "host";
try
{
client.Send("guoli.wang@yidatec.com", "guoli.wang@yidatec.com", "1", "222");
blnFlag = true;
}
catch (Exception ex)
{
throw ex;
}
return blnFlag;
}

/*
* 带附件的发送方法
*/
//a.zip位置：E:/Test/WinFormTest/WinFormTest/bin/Debug
Attachment attachment = new Attachment("a.zip", MediaTypeNames.Application.Zip);
message.Attachments.Add(attachment);