Forum Discussion
EDGE 2019 Server - Unable to relay recipient in non-accepted domain
we are in the middle of a side by side upgrade of our on-prem Exchange servers from 2016 to 2019. The mailbox server and the hybrid server have both been successful with their 2016 counterparts ready...
Check DNS settings on the Edge server. Ensure that it can resolve the MX records for your recipient domains.
thank you for your time and consideration, i have run nslookup set q=MX and checked arccorp.com on both EDGE 2016 and the EDGE 2019 system with identical results. i have also run on both systems resolve-dnsname -name arccorp.com -type MX and both come back with on-prem domain controllers that they both can tracert to if necessary.
If there is a firewall between the Edge server and the DNS servers, ensure that the necessary DNS traffic (UDP/53) is allowed.