Email sent from an external domain is not received on a Plesk server.
Following entries are found in
example dk_check: DKIM verify result: DKIM Feed: No signature
example dmarc: Starting the dmarc filter...
example dmarc: DMARC: REJECT message for [email protected]
example postfix-local: message discarded by a mail handler
Message is rejected due to incorrect DMARC record.
Use one of the following solutions:
Advise the sender to configure the DMARC record for the outgoing domain.
Disable DMARC check for incoming mail on the server.
Add the domain to white list under Plesk> Tools & Settings > Mail Server Settings > White List