无法使用SMTP发送电子邮件到外部域 [英] Unable to send emails to external domain using SMTP

问题描述

我无法使用以下代码将电子邮件发送到外部域名，如[e-mail]。

I am not able to send emails to external domain addresses like '[e-mail]' using the code below.

SmtpClient smtpClient = new SmtpClient(smtpMailServer);
smtpClient.UseDefaultCredentials = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;

//Sending mail.
smtpClient.Send(mailMessage);

我收到例外 -

邮箱不可用。服务器响应是：5.7.1无法中继[e-mail]

如果我将DeliveryMethod更改为 -

If I change the DeliveryMethod to -

smtpClient.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;

我可以在本地机器上发送电子邮件。但是在生产站点出现异常 -

I am able to send the emails on my local machine. But it fails on the production site with an exception -

无法获取IIS代理目录

你能否建议我该怎么办？

Can you please suggest me what to do?

推荐答案

我有这个问题和认证固定如下所示：

I had this issue and authenticating fixed it see below:

        SmtpClient client = new SmtpClient(EmailServer, 25);
        var SmtpUser = new System.Net.NetworkCredential("domain\\username", "password");
        client.Credentials = SmtpUser;
        client.DeliveryMethod = SmtpDeliveryMethod.Network;

我不得不使用双斜杠，因为一个斜杠是转义字符，所以使用两个它来工作。

I had to use the double slash since one slash is the escape character so use two for it to work.

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