使用外部SMTP 通常我们喜欢使用Wordpress Thread Comment 或 Mail To Commenter这两款插件 前者久未更新 SMTP configuration WP SMTP mail 本地配置行，为什么上传到远程不行，是虚机配置问题？ 比如GMAIL用的是465端口 Are you trying to configure your wordpress installation to send email from your gmail account? Install the ‘Configure SMTP’ plugin, and check the ‘Send e-mail via GMail?’ box. Send a test email to make sure everything is working. You might get the error message “SMTP Error: Could not connect to SMTP host.” You just need to open port 465 on your firewall. Ask your hosting provider / system administrator to do this for you. If it still doesn’t work, you might need to double-check your gmail password. Feel free to leave a comment if you are still having trouble. An error was encountered while trying to send the test e-mail. SMTP Error: Could not connect to SMTP host. Failed to connect to server Connection refused