Not a whole lot to go on here, but all the URLs in your error messages do point to the (known) problems:
Google is saying you don't have a PTR setup for your IP, and they note that here: https://support.google.com/a/answer/81126?p=sender-guidelines-ip&rd=1#ip 1) setup forward and reverse DNS for your mailserver, ensure they match, check them against a public nameserver. Yahoo is noting that you should have SPF and DMARC records: https://senders.yahooinc.com/smtp-error-codes#dmarc-fail for more which also points to a whole checklist of things to successfully deliver to yahoo and other major providers: https://senders.yahooinc.com/best-practices/ 2) setup at least SPF and DMARC records You can do some basic testing from outside your network with something like MXToolbox: https://mxtoolbox.com/SuperTool.aspx?action=mx%3ateisprint.com&run=toolpage And then you can ask any Postfix-specific stuff here, because nothing I'm seeing looks like a Postfix problem, it's more of a "get all your DNS and various 'authenticaion' records in order". HTH, Charles > On Jun 7, 2026, at 3:49 PM, Al via Postfix-users <[email protected]> > wrote: > > Hi, > > I setup a new postfix server and I am getting errors. Also, postfix-users > keeps disabling my account, so please CC me directly. Everything worked just > fine on the old server and I was able to forward all the emails. On the new > server, pretty much everything is bouncing. > > The errors I am getting with forwarded emails are: > > host mta7.am0.yahoodns.net[67.195.204.79] said: 554 5.7.9 > This mail has been blocked because it failed authentication checks against > the sending domains DMARC policy. See > https://senders.yahooinc.com/smtp-error-codes#dmarc-fail for more > information. (in reply to end of DATA command) > > and > > host mx-att.mail.am0.yahoodns.net[98.137.26.68] said: 554 > 5.7.9 This mail has been blocked because it failed authentication checks > against the sending domains DMARC policy. See > https://senders.yahooinc.com/smtp-error-codes#dmarc-fail for more > information. (in reply to end of DATA command) > > Recently, I started getting a new error and this is with emails that I am > sending: > > host gmail-smtp-in.l.google.com[172.217.215.26] said: 550-5.7.25 > [173.248.207.241] The IP address sending this message does not have a > 550-5.7.25 PTR record setup, or the corresponding forward DNS entry does > not 550-5.7.25 match the sending IP. As a policy, Gmail does not accept > messages 550-5.7.25 from IPs with missing PTR records. For more > information, go to 550-5.7.25 > https://support.google.com/a?p=sender-guidelines-ip 550-5.7.25 To learn > more about Gmail requirements for bulk senders, visit 550 5.7.25 > https://support.google.com/a?p=sender-guidelines. > 956f58d0204a3-65d96cd6331si1249115d50.291 - gsmtp (in reply to end of DATA > command) > > Please let me know what I need to change to fix these issues. Thanks in > advance! > > Kind Regards, > Al > _______________________________________________ > Postfix-users mailing list -- [email protected] > To unsubscribe send an email to [email protected]
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