WHMCS Email Sending Failed – SMTP connect() failed
WHMCS Email Sending Failed – SMTP Error: Could not authenticate
Validation Error: The following From address failed: noreply@yourdomain.com : MAIL FROM command fail
Validation Error: The following From address failed: noreply@yourdomain.com : MAIL FROM command failed,mail from account doesn’t conform with authentication (Auth Account:support@yahuhost.net|Mail Account:noreply@yourdomain.com) ,440,SMTP server error: MAIL FROM command failed Detail: mail from account doesn’t conform with authentication (Auth Account:support@yahuhost.net|Mail Account:noreply@yourdomain.com) SMTP code: 440
首先要排除SMTP端口是否被防火墙限制，如防火墙已解除SMTP Port限制，还发生如上错误，请检查以下设置
1. 检查WHM ->> SMTP restriction
2.检查WHMCS系统设置（以WHMCS 8.0为例）
以下图片所示的邮箱地址设置要一致，否则会报错
3. 设置完成，WHMCS 发件SMTP问题成功解决
