DMARC is a technical specification that allows Message Senders and Message Receivers to cooperate and thereby better detect when messages don’t actually originate from the Internet domain they claim to have been sent from. It does this by allowing the Domain Owner to indicate they are using email authentication on the messages they send, optionally requesting that messages that fail to authenticate be blocked. Message Receivers honor these requests (unless there is a local policy overriding this action), and send reports on all the messages – whether or not they pass email authentication – to the Domain Owner. For more information please review the DMARC Overview. The specification has been published as an Informational document by the IETF as RFC7489.

DMARC is a technical specification that allows Message Senders and Message Receivers to cooperate and thereby better detect when messages don’t actually originate from the Internet domain they claim to have been sent from. It does this by allowing the Domain Owner to indicate they are using email authentication on the messages they send, optionally requesting that messages that fail to authenticate be blocked. Message Receivers honor these requests (unless there is a local policy overriding this action), and send reports on all the messages – whether or not they pass email authentication – to the Domain Owner. For more information please review the DMARC Overview. The specification has been published as an Informational document by the IETF as RFC7489.