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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 order ...
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.
2014/12/23 -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 domain too.
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.
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.
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 ...
2014/10/26 -The ALTERNATE fix is to loosen your postfix restrictions from "reject_unknown_sender_domain" to "reject_unknown_reverse_client_hostname". But ...
This issue is typically associated with DNS configuration and can be resolved by correctly setting up the reverse DNS record (PTR).
2022/1/27 -If the Exchange server cannot find the sender of the mail or the host name, then an Exchange error 450 4.7.1 is generated indicating that the ...
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.