信箱不可用。服务器响应为：5.7.1无法中继的abc@gmail.com [英] Mailbox unavailable. The server response was: 5.7.1 Unable to relay for abc@gmail.com
问题描述
我使用的是低于code;
其中以下几点可能是错误的原因，但我不知道;
1，该应用程序是开发机器上
2在SMTP IP的同时应用程序是在本地主机上运行的服务器上托管
我得到这个错误邮箱不可用服务器响应为：5.7.1无法中继的mhtbusoum@gmail.com;
昏暗的消息作为MAILMESSAGE新
message.From =新MailAddress（Strings.LCase（mhtbusoum@mysite.com））
message.To.Add（mhtbusoum@gmail.com）
message.IsBodyHtml = TRUE
message.Priority = MailPriority.Normal
message.Subject =（测试SmtpClient电子邮件发送）
message.Body =（这是测试电子邮件发送无需任何密码）
昏暗的客户端作为新SmtpClient（mailSending.actualSite.com，25）
client.UseDefaultCredentials =假
client.Send（消息）
在使用本地主机邮件服务器，该服务器将阻止未在本地主机托管的任何电子邮件地址。
要转发来自其他服务器的另一E-mail地址，您需要将IIS服务器配置授予的权限。
请参阅这个帖子的配置中继权限。
I am using the below code; One of the following points could be the reason of the error, but I don't know;
1-The application is on development machine 2-The smtp ip is hosted on the server while app is running on localhost
I am getting this error "Mailbox unavailable. The server response was: 5.7.1 Unable to relay for mhtbusoum@gmail.com";
Dim message As New MailMessage
message.From = New MailAddress(Strings.LCase("mhtbusoum@mysite.com"))
message.To.Add("mhtbusoum@gmail.com")
message.IsBodyHtml = True
message.Priority = MailPriority.Normal
message.Subject = ("Testing SmtpClient email sending")
message.Body = ("It is to test the email sending without any password")
Dim client As New SmtpClient("mailSending.actualSite.com", 25)
client.UseDefaultCredentials = False
client.Send(message)
When using localhost as mail server, the server will block any e-mail address that is not hosted in localhost.
To relay another e-mail address from other server, you will need to configure the IIS Server to grant the permission.
See this post for configure the relay permissions.
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