每次發外聯email都有email回覆

Hello, this is the mail server on mailgate.inbaby-hk.com.

I am sending you this message to inform you on the delivery status of a
message you previously sent.  Immediately below you will find a list of
the affected recipients;  also attached is a Delivery Status Notification
(DSN) report in standard format, as well as the headers of the original
message.

  <xxx@xxx.com>  delivery failed; will not continue trying