IIS 5 & IIS 6
*Secondary SMTP relay server not sending mails.
Last post Oct 22, 2020 06:50 AM by Jalpa Panchal
Oct 21, 2020 09:00 AM|Arun Thomas|LINK
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
Oct 22, 2020 06:50 AM|Jalpa Panchal|LINK
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