C# send email implementation code

public static class EmailHelper { /// 
 /// 发送邮件 /// 
 /// 邮件主题 /// 邮件内容 /// 附件地址，如果不添加附件传null或"" /// 发送人邮箱地址 /// 发送人邮箱密码 /// 接收人邮箱 public static void SendMail(string subject, string msg, string filePath, string senderEmail, string senderPwd, params string[] recipientEmail) { if (!CheckIsNotEmptyOrNull(subject, msg, senderEmail, senderPwd) || recipientEmail == null || recipientEmail.Length == 0) { throw new Exception("输入信息无效"); } try { string[] sendFromUser = senderEmail.Split('@'); //构造一个Email的Message对象 MailMessage message = new MailMessage(); //确定smtp服务器地址。实例化一个Smtp客户端 System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp." + sendFromUser[1]); //构造发件人地址对象 message.From = new MailAddress(senderEmail, sendFromUser[0], Encoding.UTF8); //构造收件人地址对象 foreach (string userName in recipientEmail) { message.To.Add(new MailAddress(userName, userName.Split('@')[0], Encoding.UTF8)); } if (!string.IsNullOrEmpty(filePath)) { Attachment attach = new Attachment(filePath); //得到文件的信息 ContentDisposition disposition = attach.ContentDisposition; disposition.CreationDate = System.IO.File.GetCreationTime(filePath); disposition.ModificationDate = System.IO.File.GetLastWriteTime(filePath); disposition.ReadDate = System.IO.File.GetLastAccessTime(filePath); //向邮件添加附件 message.Attachments.Add(attach); } //添加邮件主题和内容 message.Subject = subject; message.SubjectEncoding = Encoding.UTF8; message.Body = msg; message.BodyEncoding = Encoding.UTF8; //设置邮件的信息 client.DeliveryMethod = SmtpDeliveryMethod.Network; message.BodyEncoding = System.Text.Encoding.UTF8; message.IsBodyHtml = false; //如果服务器支持安全连接，则将安全连接设为true。 //gmail,qq支持，163不支持 switch (sendFromUser[1]) { case "gmail.com": case "qq.com": client.EnableSsl = true; break; default: client.EnableSsl = false; break; } //设置用户名和密码。 client.UseDefaultCredentials = false; //用户登陆信息 NetworkCredential myCredentials = new NetworkCredential(senderEmail, senderPwd); client.Credentials = myCredentials; //发送邮件 client.Send(message); } catch (Exception ex) { throw (ex); } } /// 
 /// 验证所有传入字符串不能为空或null /// 
 /// 参数列表 /// 都不为空或null返回true，否则返回false public static bool CheckIsNotEmptyOrNull(params string[] ps) { if (ps != null) { foreach (string item in ps) { if (string.IsNullOrEmpty(item)) return false; } return true; } return false; } }