BIMI (Brand Indicators for Message Identification)
BIMI is a standard that displays your verified brand logo next to your emails in supporting inboxes — but only for domains that have enforced DMARC, turning authentication into a visible trust signal.
How BIMI works
BIMI lets you publish a logo in your DNS that supporting mailbox providers display next to your messages. It's not a standalone feature — it's a reward for strong authentication. A provider will only show your logo once your domain has DMARC at an enforced policy (quarantine or reject), proving the mail is genuinely yours.
The visible logo raises brand recognition and trust in a crowded inbox, and gives recipients an at-a-glance cue that the message is authentic rather than a spoof.
What BIMI requires
- SPF and DKIM passing with alignment on your sending domain
- DMARC published at p=quarantine or p=reject — monitor-only (p=none) is not enough
- A square SVG logo hosted at a public URL, referenced in a BIMI DNS record
- For most major inboxes, a Verified Mark Certificate (VMC) proving you own the trademark
Why BIMI is worth it
- Turns invisible authentication into a visible trust badge
- Increases brand recall every time your mail appears
- Signals legitimacy, helping recipients distinguish you from phishing
- Reinforces the discipline of full DMARC enforcement, which improves deliverability anyway
Frequently asked questions
Do I need DMARC before BIMI?
Yes — enforced DMARC (quarantine or reject) is a hard prerequisite. BIMI is designed as a visible reward for domains that have fully committed to authentication.
Is a VMC required for BIMI?
Several major providers require a Verified Mark Certificate — a paid credential proving you own the logo as a registered trademark. Some inboxes display BIMI without one, but coverage is best with it.
Which inboxes show BIMI logos?
Support is growing across major consumer providers. Coverage varies, so treat BIMI as a bonus trust signal on top of good deliverability, not a guarantee everywhere.
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