Office 365 has a compelling suite of security features. In fact you can justify the migrating your business email to Office 365 (Exchange Online) even from a security perspective, to ramp up your security best practices.
Email protection and authentication in Office 365 requires manual work. Deterring email spoofing (impersonating your email “from” address) includes as a solid start – the SPF, DKIM, and DMARC email authentication standards.
- To setup SPF in Office 365 to prevent spoofing: https://docs.microsoft.com/en-us/office365/securitycompliance/set-up-spf-in-office-365-to-help-prevent-spoofing
- To setup DKIM in Office 365 to validate your outgoing email from your business domain: https://docs.microsoft.com/en-us/office365/securitycompliance/use-dmarc-to-validate-email
- DMARC depends on SPF and DKIM to work. Once SPF and DKIM are configured, tested, and working – don’t forget DMARC.