Yahoo! JAPAN

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 ...

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.

2021/2/16 -Workaround. If all of the commands provided show the correct IP, hostname, or result in "OK," then the issue may have been temporary. Please ...

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 ...

2020/7/6 -On #Exchange2013 I am getting the error message as follows, generated the error '[{LRT=};{LED=450 4.7.25 Client host rejected: cannot find your ...

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 ...

2021/1/12 -Solved: Hello I have had my email server running for 2 or so years and all reverse/forward dns and PTR records as well as MX and so on and ...

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

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 ...

2020/4/14 -Recently i've needed to begin sending e-mails to an international client who seems to have a bit of a strict mailserver setup (as other ...