C#发送邮件

用C#写的一个发送邮件方法。

/// <summary>
/// 发送邮件给相关人
/// </summary>
/// <param name="sendToList">收件人列表</param>
/// <param name="attachment">附件</param>
/// <param name="subject">邮件主题</param>
/// <param name="mailBody">邮件内容</param>

public void SendEmailByJoeleo(string sendToList, string attachment, string subject, string mailBody)
{
    MailMessage mail = new MailMessage();
    sendToList = sendToList.Trim().TrimEnd(';');
    if (sendToList.Length == 0)
    {
        throw new Exception("程序没有获取到文件的收件人列表，请检查是否没有设置！");
    }
    mail.From = new MailAddress("dream21through@163.com");
    foreach (string to in sendToList.Split(';'))
    {
        mail.To.Add(to);
    }
    mail.IsBodyHtml = false;
    mail.Subject = subject;
    mail.Body = mailBody;
    mail.SubjectEncoding = Encoding.GetEncoding("gb2312");
    mail.BodyEncoding = Encoding.GetEncoding("gb2312");
    if (attachment.Length > 0)
    {
        mail.Body = mailBody + "\n\r随邮件带附件：" + attachment;
        if (File.Exists(attachment))
        {
            Attachment mailAttach = new Attachment(attachment);
            mail.Attachments.Add(mailAttach);
        }
    }
    SmtpClient smtp = new SmtpClient("smtp.163.com");
    smtp.Credentials = new System.Net.NetworkCredential("dream21through@163.com", "xxxxxx");
    smtp.Send(mail);
    mail.Dispose();
}