Email is unavailable. The server response is 5.7.1 unable to replay for xxx@163.com mailbox unavailable. Server Response: 5.7.1 unable to replay for xxx@163.c

Email is unavailable. Server Response: 5.7.1 unable to replay for xxx@163.com Microsoft's "virtual SMTP Service" can be used to forward mail. That is to say, we can program the use of the virtual SMTP service to send mail, without directly binding to the mail SMTP server, or even bypassing the sender's user name and password verification.
Generally, the default settings of the virtual SMTP service can send emails, but sometimes you may encounter mailbox unavailability. The server response is 5.7.1 unable to relay for my hair box.
Error

You need to change the settings of the default SMTP virtual server.
Right-click -- Property -- access -- relay -- add 127.0.0.1 to allow.
Microsoft's "virtual SMTP Service" can be used to forward mail. That is to say, we can program the use of the virtual SMTP service to send mail, without directly binding to the mail SMTP server, or even bypassing the sender's user name and password verification.
Generally, the default settings of the virtual SMTP service can send emails, but sometimes you may encounter mailbox unavailability. The server response is 5.7.1 unable to relay for my hair box.
Error

You need to change the settings of the default SMTP virtual server.
Right-click -- Property -- access -- relay -- add 127.0.0.1 to allow.