Since the email client only displays the From address, the user sees 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 does 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 The 5322.From address isn't authenticated when you use SPF by itself, which allows for a scenario where a user gets a message that passed SPF checks but has a spoofed 5322.From sender address. Normally, SPF checks are only performed against the 5321.MailFrom address. SPF uses a DNS TXT record to list authorized sending IP addresses for a given domain. The From address is sometimes called the 5322.From address. That is, the mailbox of the person or system responsible for writing the message. From address identifies the author of the email. 'From' address: The address displayed as the From address by your mail application. Mail From address appears in the envelope portion of an email message and isn't displayed by your email application, and is sometimes called the 5321.MailFrom address or the reverse-path address. 'Mail From' address: Identifies the sender and says 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?Īn email message may contain multiple originator or sender addresses. Visit for the steps to enable DMARC Reporting for Microsoft Online Email Routing Addresses (MOERA) and parked Domains. Hove you seen our step-by-step guides? Configuration 1-2-3s and no frills, for admins in a hurry.

Microsoft setup