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] ##