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Unable to send emails to particular domains from exchange 2007 but can receive emails from these domains

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Dear Team,

Our customer  faces the below problem that whenever they try to send emails to specific domains[around 3] they receive the below error

Can anyone have any idea on how to resolve this? Please consider this as high priority

451 4.4.0 primary target IP address responded with:"550 No reverse dns for IP 115.42.147.33 Attempted failover to alternate host, but that did not succeed

451 4.4.0 Primary target IP address responded with:"421 4.1.2 <magyarhus@t-online.hu>: Recipient address rejected:No reverse name for your IP address[115.42.147.33]

mx-k3.invitel.net #554 5.7.1 Client host rejected: cannot find your hostname, [115.42.147.33] ##


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