- Domain example.com is hosted on Plesk server.
While checking the domain using the tool dnscheck.pingdom.com, the following information is shown:
No address found for mail.example.com
Delivery over IPv4 to firstname.lastname@example.org could not be done.
Failed to deliver email for SOA RNAME of example.com (info.example.com) using email@example.com.
mail.example.com does not get resolved to an IP address:
# dig +short mail.example.com
A record is missing for mail.example.com.
Go to Domains > example.com > DNS Settings and add A record with domain name mail.example.com and domain's IP address as value: