I am using Zimbra Collaboration 8.8.8.GA.2009 Open Source Software for Mailing solution. My Mail server is working perfectly for all other domains and I had also created all DNS Records correctly. But when I am trying to send a mail to Payu.com domain I will get an error.
From many days I am facing this issue with one of the Office 365 Domain which I am unable to send messages to payu.com domain. When I am sending the mail to payu.com domain I am getting below error saying dkt test
"Your message to firstname.lastname@example.org couldn't be delivered.
sainath is not authorized to relay messages through the server that reported this error."
Sometimes I will also get the different error
Subject: Test Mail
Could not be delivered because of
Server refused mail at END OF DATA - 554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [VE1EUR02FT057.eop-EUR02.prod.protection.outlook.com]
The following recipients were affected:
Would someone help me in resolving this issue. Its a payment gateway so, I need to get a solution for this on priority. Thank you in advance.
If you need any additional information. Please let me know.
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