Yahoo! JAPAN

2010/2/9 -This is caused by the reject_unknown_client instruction ( http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname ).

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 ...

Symptoms. Emails are not delivered to recipients. Emails remain in mail queue at Tools & Settings > Mail Server Settings > Mail Queue tab.

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. Deployment ...

Hi,. I'm using zimbra with Postfix as MTA. I got the following error message which indicate mail rejection based on hostname not find.

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 to ...

2024/4/18 -Cause. Incorrect or missing PTR record of the sender's mail server. Resolution. Contact the server hoster or provider of the IP address in order ...

2018/9/26 -Hi, I was wondering if someone could shed some light on the issue im having. Currnelty have disabled smtp helo checks, and greylist disabled ...

2023/5/15 -Re: 450 4.7.25 Client host rejected: Cannot find your hostname. Add the A type DNS record for this hostname.

2019/1/14 -Hi, How to allow a domain in EFA who have no PTR record. I don't want to remove postfix restriction for PTR record.