Web Reference: May 28, 2021 · DevOps & SysAdmins: Postfix 451, 4.3.0 : Temporary lookup failure (2 Solutions!!) Oct 11, 2023 · Ensure that your server is not sending spam or malware. Check your server's reputation. Sites like mxtoolbox.com and senderbase.org can help you see if your server IP is on any blacklists. Make sure you have a correct reverse DNS (PTR) record set up for your mail server. Oct 9, 2018 · non-null host address bits in "10.10.10.5/22" your ip/netmask looks wrong. I've also added the ip from which I am trying to send the email. From the local smtp the sending is ok, from outside it's not working.
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