Yahoo! JAPAN

2017/5/18 -Hello. I am having a big issue with this. I am using Plesk Onyx Version 17.5.3 Update #6 Web Host Edition on Ubuntu 14.04.5 LTS.

2017/11/26 -1 Client host rejected: cannot find your reverse hostname is encountered. We strongly advise contacting your recipient's email provider to check ...

2014/12/23 -You need a PTR record that resolves 128.199.39.109 to the hostname of your sending server. Might also want to look into SPF records for your ...

2018/5/8 -Hi, we have installed 2 x ESA C190 in cluster. all MX Record, A Record, PTR record is configured on public DNS. now both ESA are in ...

2017/3/3 -Hi, Today I just deployed mailcow to a new fresh Centos 7,2 installation. The same thing happened to me. It prevented the server to receive mail ...

2012/9/7 -This normally means that the address you are trying to send email to, the server is using reverse look ups. This means you send an email from ...

2022/1/27 -The server rejects emails sent from one of these domains. '450 4.7.1 Client host rejected: cannot find your reverse hostname'; If the Exchange ...

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 ...