Can I use both include:spf.sendinblue.com and include:spf.brevo.com?

No. Use only one include whichever Brevo shows in your dashboard. Having both can bloat SPF and risk evaluation errors.

Do I need a dedicated subdomain for Brevo?

Not required, but recommended for traffic isolation and reputation control. If used, authenticate the subdomain in Brevo and publish SPF/DKIM there.

When should I move DMARC to reject?

After 2 weeks of stable aggregate reports with aligned, authenticated traffic and no legitimate sources failing. Move from p=none p=quarantine p=reject .

Does a dedicated IP improve deliverability?

It can, if you maintain low complaint rates, consistent cadence, and proper warm-up. Authentication remains foundational.

Brevo (Sendinblue) SPF & DKIM Setup: Enterprise-Grade Guide

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Brevo (Sendinblue) SPF & DKIM Setup: Enterprise-Grade Guide

End-to-end SPF, DKIM, and DMARC configuration for Brevo (Sendinblue), with validation, alignment, rotation, and enterprise best practices to maximize deliverability.

16 min read

Updated 2025-10-24

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