Microsoft 365

SPF: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-spf-configure?view=o365-worldwide

DKIM: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dkim-configure?view=o365-worldwide

DMARC: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dmarc-configure?view=o365-worldwide

Google Workspace

SPF: https://support.google.com/a/answer/10684623?hl=en

DKIM: https://support.google.com/a/answer/180504?hl=en

DMARC: https://support.google.com/a/answer/2466563?hl=en

***IMPORTANT: If you have ETP, do not change MX records as this will bypass inbound email filtering. These are the only MX records that should be present.