*Secondary SMTP relay server not sending mails.

Question

User-2062540605 posted

Hi team

Recently i have configured two smtp relay server on my environment. Both are running in server OS 2019 and both server are in same domain but in different location.

i am getting mail through one SMTP replay server and not through second smtp relay server. we have opened ports and checked in network part and there is no port blocked . i have reconfigure the server and still mails are in the bad mail folder.

Diagnostic-Code: smtp;553 #5.1.8 Domain of sender address <> does not exist

no idea where is the problem

Answer 1

User-848649084 posted

Hi,

Your form address's domain doesn't exist (it has neither an A record nor an MX record), that's why it's getting rejected.

Add an MX and/or A record for that subdomain and your issue will resolve.

You could try to use nslookup to check if the server sees the DNS records:

nslookup -type=mx walkingtree.in


dig walkingtree.in MX