We are currently looking into issues with receiving certain emails.
Our email gateway is currently set to reject any emails from domains which do not have a published DMARC record and contains an envelope sender address (DMARC checks are skipped if no envelope sender address is used).
Is it recommended to quarantine incoming messages with no DMARC record, or should they be allowed through?
(other spam/virus/BEC etc. checks are still performed regardless)