When i send massage in my work mail to gmail.com domian, my massage is back and in it the following.
I have no idea what to do with it, I thought the problem was in the mailcow version, but when I updated the problem remained.
This is the mail system at host mail.chnpu.edu.ua.
I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
sribneskola2013@gmail.com: host gmail-smtp-in.l.google.com[64.233.164.27]
said: 550-5.7.25 [91.192.47.142] 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.
38308e7fff4ca-2f3e2fdae4asi13409461fa.203 - gsmtp (in reply to end of DATA
command)
