SMTP 错误:“客户端无权向此服务器提交邮件"

问题描述

我在发送电子邮件时收到以下错误.可能是什么原因?

I'm getting the following error while sending email. What could be the cause?

客户没有权限向此服务器提交邮件.服务器响应是:5.5.1 STARTTLS 可能不会重复.

Client does not have permission to submit mail to this server. The server response was: 5.5.1 STARTTLS may not be repeated.

这是堆栈跟踪...

堆栈跟踪

at System.Net.Mail.StartTlsCommand.CheckResponse(SmtpStatusCode statusCode, String response)
at System.Net.Mail.StartTlsCommand.Send(SmtpConnection conn)
at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port)
at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port)
at System.Net.Mail.SmtpClient.GetConnection()
at System.Net.Mail.SmtpClient.Send(MailMessage message)

我正在使用端口 587/465 上的 SSL 连接到 smtp.gmail.com

I'm connecting to smtp.gmail.com with SSL on port 587 / 465

推荐答案

也许 SMTP 服务器需要身份验证(用户名/密码)而您不提供?(只是猜测)

Perhaps the SMTP server requires authentication (username / password) and you don't supply them? (Just a guess)

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