2016年 04月 30日
2016/04/30 1:09 "Mail Delivery Subsystem"
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain ezweb.ne.jp by lsean.ezweb.ne.jp. [18.104.22.168].
The error that the other server returned was:
550 : User unknown