[pfx] Postfix not able to forward emails

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
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