MailMessage 问题

Question

使用MailMessage中的Attachments

进行邮件附件的发送

有大小限制么？

 

这是附件部分的代码

 Stream fileReader = new FileStream(fileInfo.FullName, FileMode.Open);               

                attachment = new Attachment(fileReader, fileInfo.Name);
               
                _mailMessage.Attachments.Add(attachment);

小文件1M以内的没有问题

大了以后就出现

发送邮件失败  索引超出界限的错误

 

---

Hero

Answer 1

和WPF无关，不过我认为附件大小不是 MailMessage 决定的，是你的邮件服务器决定的。所以要check邮件服务器设置，而不是MailMessage的设置。

---

Bob Bao [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 2

恩，我也看了

SmtpClient这个类

好像也没有关于设置文件大小的地方

 

void SendMail()
        {
            SmtpClient _smtpClient = new SmtpClient();
            _smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
            _smtpClient.Host = GetMailNet(m_Address);//指定SMTP服务器
            _smtpClient.Credentials = CredentialCache.DefaultNetworkCredentials;

            _smtpClient.Credentials = new System.Net.NetworkCredential(m_Address, m_Pwd);//用户名和密码

            MailMessage _mailMessage = null;
            try
            {
                _mailMessage = new MailMessage(m_Address, t_Address);
            }
            catch
            {
                MessageBox.Show("Sender or recipient address is not correct！");
                return;
            }

            _mailMessage.Subject = mailTitle;//主题
            _mailMessage.Body = mailContent;//内容
            _mailMessage.BodyEncoding = System.Text.Encoding.UTF8;//正文编码
            _mailMessage.IsBodyHtml = true;//设置为HTML格式
            _mailMessage.Priority = MailPriority.High;//优先级


            Attachment attachment = null;
            if (fileInfo != null)
            {
                //Stream fileReader = new FileStream(fileInfo.FullName, FileMode.Open);               

                //attachment = new Attachment(fileReader, fileInfo.Name);

                attachment = new Attachment(fileInfo.FullName, MediaTypeNames.Application.Octet);
                // Add time stamp information for the file.
                ContentDisposition disposition = attachment.ContentDisposition;
                disposition.CreationDate = System.IO.File.GetCreationTime(fileInfo.FullName);
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(fileInfo.FullName);
                disposition.ReadDate = System.IO.File.GetLastAccessTime(fileInfo.FullName);

                _mailMessage.Attachments.Add(attachment);

            }
            try
            {
                dis.BeginInvoke(new StopAngle(HideBorder), System.Windows.Threading.DispatcherPriority.Normal);
                //border.Visibility = System.Windows.Visibility.Hidden;
                _smtpClient.Send(_mailMessage);//发送
                fileInfo = null;
                attachment.Dispose();
               
            }
            catch
            {
                MessageBox.Show("Send failed!");
                attachment.Dispose();
            }

}

 

这就是发送的过程了

---

Hero

Answer 3

没错，你咨询下SMTP的配置，是否那边限制了？

---

Bob Bao [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 4

啊。去哪里咨询？比如QQ的邮箱，去问腾讯的客服？

 

---

Hero

Answer 5

QQ邮箱的帮助信息里面应该有说明，它允许附件的大小。你可以看一下

---

Bob Bao [MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 6

好的。OK

---

Hero