Without knowing your setup or code, I would look into the inner exception - "Unable to connect to the remote server".
Do you actually have access to the SMTP server?
Could there be a block due to a system or network firewall? Some ISPs block port 25 in order to stop bot spamming, you may need to connect via a different port.
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在不知道您的设置或代码的情况下，我会调查内部异常 - “无法连接到远程服务器”。
您实际上有权访问 SMTP 服务器吗？
是否会因为系统或网络防火墙而被阻止？
某些 ISP 会阻止端口 25 以阻止机器人垃圾邮件，您可能需要通过其他端口进行连接。
Without knowing your setup or code, I would look into the inner exception - "Unable to connect to the remote server".
Do you actually have access to the SMTP server?
Could there be a block due to a system or network firewall?
Some ISPs block port 25 in order to stop bot spamming, you may need to connect via a different port.