Yahoo! JAPAN

Cause. Incorrect or missing PTR record of the sender's mail server. Resolution. Contact the server hoster or provider of the IP address in ...

2013/11/8 -When a user here sends an email to a particular domain it bounces back with: 450 4.7.1 Client host rejected: cannot find your hostname. I'm ...

2018/12/23 -The error message 'Client host rejected: cannot find your hostname' is displayed to the sender if his provider has configured the IP ...

2020/7/6 -25 Client host rejected: cannot find your hostname, [xxx.xxx.xxx.130]};{FQDN=};{IP=}]'. I am getting this error message only when the user ...

THE PROBLEM. The mail server's source IP address which is trying to send mail to parabon.com does not have proper reverse DNS entries setup or the DNS ...

2021/2/16 -Description · 1 . Check the hostname resolves from a workstation other than the server: · 2 . Make sure the IP from the above command is bound ...

2020/7/6 -25 Client host rejected: cannot find your hostname, [xxx.xxx.xxx.130]};{FQDN=};{IP=}]'. I am getting this error message only when the user sends ...

2020/10/14 -I configured an A entry in our DNS manager for our domain. But it seems that the configuration of the datacenter's resolution is getting ...

I've configured SMTP properly yet I can't deliver my mail (e.g. by testing the mail) as a valid hostname has to be sent to the mailserver.

2018/8/22 -It sounds like your nameserver is not providing your postfix server with the result of: unbound-host 212.227.17.21 21.17.227.212.in ...