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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 ...
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 ...
2013/11/22 -I've been unable to message users at the domain kupwg.de, and the SMTP error I get is: 450 4.7.1 Client host rejected: cannot find your hostname.
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.
2014/10/26 -The ALTERNATE fix is to loosen your postfix restrictions from "reject_unknown_sender_domain" to "reject_unknown_reverse_client_hostname". But ...
When Exchange server not able to find out the sender of mail or not able to find out the hostname, in that case Exchange error 450 4.7.1 is generated that will ...
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.
2021/2/16 -Checks against the hostname are needed to ensure that the hostname is properly resolving to the server. Here are the commands needed to perform this check.
2656124 - XS609. 450 4.7.1 Client host rejected: cannot find your hostname. Symptom: Image/data in this KBA is from SAP internal systems, sample data, or demo ...
Resolution. Contact the server hoster or provider of the IP address in order to correct PTR record and make it pointing to the mail server hostname. For Plesk ...