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2017/10/13 -Please make sure your Server is using valid nameserver (/etc/resolv. conf) or know your hostname in /etc/hosts.
Contact the server provider of the IP address in order to correct PTR record and make it point to the mail server hostname.
2013/11/22 -Check the DNS settings on the outbound mailserver. Make sure you alse have a PTR record set up for the hostname that is send with the EHLO/HELO ...
2018/8/22 -Re: [Solved] Postfix: Client host rejected: cannot find your hostname. 212.227.17.21 should be the gmx's ip which (normally) has an reverse dns.
2017/5/18 -I am using Plesk Onyx Version 17.5.3 Update #6 Web Host Edition on Ubuntu 14.04.5 LTS. I get this error when users try to send mail to any adress @siol.net.
2020/8/28 -Here is a copy of the rejection notice our user received when attempting to reply to an email. (reason: 550 5.7.25 Client host rejected: cannot find your ...
2018/7/4 -i see this error : 450.4.7.1 client host rejected: cannot find your reverse hostname i add this address to whit list. i check my dns. and my ...
2019/2/8 -You should be able to force a PTR record through unbound by adding the following to data/conf/unbound/unbound.conf in the server block.
2018/5/9 -The error suggests the destination server is unable to lookup a PTR record for the IP it is receiving the connection from. You may want to ...
2013/7/23 -If you get the error immediately and are running MDaemon as your mail server, check your inbound SMTP log which can be found on the MDaemon server.