Please select Jmail in the management area and system parameters, call 21cn's email address and 21cn's SMTP to send emails, and generally you can receive it.
There are many reasons why users cannot receive your email, such as treating it as spam, or your email address is abnormal, or IP is blacklisted.
There are many reasons why users cannot receive your email, such as treating it as spam, or your email address is abnormal, or IP is blacklisted.