First Contact Safety Tip is a feature in Microsoft Office 365 to better protect users from phishing attacks. First Contact Safety Tip is part of Microsoft Defender for Office 365 or Exchange Online Protection and helps users detect fake or fraudulent mails.
If a suspicious email is received, the email will have a warning in the header informing the user that it may be phishing email. The warning is shown in one of the following cases:
– the sender sends an email to the mailbox for the first time
– the sender very rarely sends an email to this mailbox