Like the DNS records for SPF, the record for DMARC is a DNS text (TXT) record that helps prevent spoofing and phishing. In the example above, if there is a DMARC TXT record in place for, then the check against the From address fails. When you use DMARC, the receiving server also performs a check against the From address. Since the email client only displays the From address, the user sees that this message came from With SPF alone, the validity of was never authenticated. Mail from address (5321.MailFrom): address (5322.From): you configured SPF, then the receiving server performs a check against the Mail from address If the message came from a valid source for the domain, then the SPF check passes. In this transcript, the sender addresses are as follows: S: Please click the following link to verify that Microsoft has the right information for your account. S: We need to verify your banking details. S: Subject: Woodgrove Bank - Action required For example, consider this SMTP transcript: S: Helo This allows for a scenario where a user can receive a message, which passes an SPF check but has a spoofed 5322.From sender address. This means that the 5322.From address is not authenticated when you use SPF by itself. Normally, SPF checks are only performed against the 5321.MailFrom address. SPF uses a DNS TXT record to provide a list of authorized sending IP addresses for a given domain. This is sometimes called the 5322.From address. That is, the mailbox of the person or system responsible for writing the message.

This address identifies the author of the email. 'From' address: The address displayed as the From address by your mail application.

This is sometimes called the 5321.MailFrom address or the reverse-path address. This appears in the envelope portion of an email message and is not displayed by your email application. 'Mail From' address: Identifies the sender and specifies where to send return notices if any problems occur with the delivery of the message, such as non-delivery notices. These addresses are used for different purposes. How do SPF and DMARC work together to protect email in Microsoft 365?ДЄn email message may contain multiple originator or sender addresses. Visit the Microsoft Intelligent Security Association (MISA) catalog to view third-party vendors offering DMARC reporting for Microsoft 365.

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