日本語のみで絞り込む
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-addr.
2025/3/4 -Resolution. Contact the server provider of the IP address in order to correct PTR record and make it point to the mail server hostname. For ...
2019/6/4 -Some people suggest to just disable reject_unknown_client_hostname . I don't like this solution. I think you can do better and just allow logged ...
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 ...
2018/9/26 -Unknown clients are hostnames not matching or existing (FCrDNS) of the sending mailserver, unknown senders checks, if the domain of the sender address exists.
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.
2023/11/10 -My Thunderbird client has worked thus far. Now I cannot send messages from my "very" old account, where host domain is pp.htv.fi which has worked until ...
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 ...
2022/11/21 -Resolution. Try the following methods to troubleshoot: Ask the sender to check the mapping between the hostname and IP address in DNS records.
1. Verify rDNS Record: Senders should check if their SMTP server's IP address has a corresponding and correct rDNS record. 2. Correcting rDNS Records: If ...