依據要使用的Mail服務更改smtpAddress、portNumber以及enableSSL三個變數

主機名稱 SMTP Address Port SSL
Yahoo! smtp.mail.yahoo.com 587 True
GMail smtp.gmail.com 587 True
Hotmail smtp.live.com 587 True
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using System.Net;
using System.Net.Mail;

public void SendEmail()
{
//設定smtp主機
string smtpAddress = "smtp.mail.yahoo.com";
//設定Port
int portNumber = 587;
bool enableSSL = true;
//填入寄送方email和密碼
string emailFrom = "email@gmail.com";
string password = "abcdefg";
//收信方email
string emailTo = "someone@domain.com";
//主旨
string subject = "Hello";
//內容
string body = "Hello, I'm just writing this to say Hi!";

using (MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(emailFrom);
mail.To.Add(emailTo);
mail.Subject = subject;
mail.Body = body;
// 若你的內容是HTML格式,則為True
mail.IsBodyHtml = false;

//夾帶檔案
mail.Attachments.Add(new Attachment("C:\\SomeFile.txt"));
mail.Attachments.Add(new Attachment("C:\\SomeZip.zip"));

using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
{
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);
}
}
}
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