"Sender Domain Not Found" means that Trend Micro Email Security cannot retrieve the DNS A record or Mail Exchange (MX) record for the sender domain.
To resolve this issue, you can add the email sender to the Approved Sender list. It can then bypass the sender domain check.
Trend Micro Email SecurityAll
Know the cause of the error "Sender Domain Not Found", and how to take action if you encounter this error.
"Sender Domain Not Found" means that Trend Micro Email Security cannot retrieve the DNS A record or Mail Exchange (MX) record for the sender domain.
To resolve this issue, you can add the email sender to the Approved Sender list. It can then bypass the sender domain check.
