Question

我们有一个在Windows Server 2008计算机上运行的应用程序。它使用office365 smtp中继帐户发送电子邮件。但是，所有电子邮件都未成功发送。我们在smtp.Send调用发送的电子邮件中随机获得这两个例外：

System.Net.Mail.SmtpFailedRecipientsException：无法发送给所有收件人。 ---＆GT; System.Net.Mail.SmtpFailedRecipientException：邮箱不可用。服务器响应是：5.7.64 TenantAttribution;中继访问被拒绝
System.Net.Mail.SmtpFailedRecipientException：系统存储空间不足。服务器响应为：4.5.3收件人太多

到目前为止，我们还未能弄清楚为什么会这样。任何想法都表示赞赏。

电子邮件代码使用System.Net.Mail命名空间 - .Net framework 4.0。我们传递了NetworkCredential的用户名和密码。

public void Send(string from, string[] to, string[] cc, string[] bcc, string subject, string body, string[] attachmentArr, Boolean isBodyHtml, string smtpServerName, int port = 25, bool enableSsl = true, string userName = null, string password = null, string domain = null, int timeoutMilliSec = 100000)
    {
        MailMessage objEmail = new MailMessage();

        try
        {
            foreach (string toItem in to)
            {
                objEmail.To.Add(toItem);
            }

            if (cc != null)
            {
                foreach (string toItem in cc)
                {
                    objEmail.CC.Add(toItem);
                }
            }

            if (bcc != null)
            {                    
                foreach (string toItem in bcc)
                {
                    objEmail.Bcc.Add(toItem);
                }
            }

            objEmail.From = new MailAddress(from);
            objEmail.Subject = subject;
            objEmail.Body = body;
            objEmail.IsBodyHtml = isBodyHtml;
            objEmail.Priority = MailPriority.High;

            if (attachmentArr != null)
            {
                foreach (String s1 in attachmentArr)
                {
                    objEmail.Attachments.Add(new Attachment(s1));
                }
            }

            using (SmtpClient smtp = new SmtpClient(smtpServerName))
            {
                if (string.IsNullOrEmpty(userName) == false && string.IsNullOrEmpty(password) == false)
                {
                    NetworkCredential credential = (string.IsNullOrEmpty(domain)) ? new NetworkCredential(userName, password) : new NetworkCredential(userName, password, domain);
                    smtp.Credentials = credential;
                }
                smtp.Timeout = timeoutMilliSec;
                smtp.Port = port;
                smtp.EnableSsl = enableSsl;

                smtp.Send(objEmail);
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            if (attachmentArr != null && objEmail.Attachments != null)
            {
                foreach (Attachment a1 in objEmail.Attachments)
                {
                    a1.Dispose();
                }
            }
        }
    }

Random System.Net.Mail.SmtpFailedRecipientsException异常 - 中继帐户office365

0 个答案: