mail from address must be same as authorization user
WHMCS里用户注册、账单等等邮件都能收到用的是qq企业邮箱
就是Email备份邮件收不到，提示：
Cron Job: Email Backup - Sending Failed - The following From address failed: : MAIL not accepted from server,501,mail from address must be same as authorization user
SMTP server error: mail from address must be same as authorization user
SMTP server error: mail from address must be same as authorization user
这是什么问题啊？
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