How to Set up email authentication for Office 365

Here is how to set up email authentication for Office 365.

The steps

Enable DKIM in the Microsoft admin center, add the SPF include for Office 365, and publish DMARC so Outlook trusts your mail.

The foundation

• SPF, DKIM, DMARC on your domain.
• A dedicated, warmed IP.
• Clean lists and fast bounce/complaint handling.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI watching list health and deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.