Brand Indicators for Message Identification (BIMI) is a game-changer in email security and brand trust. It allows companies to display their brand logo alongside authenticated emails, improving credibility and user engagement. But how does BIMI work under the hood, and why should you care? Let's dive into the technical details! 🔍
What is BIMI? 🤔
BIMI is a DNS-based email specification that enables businesses to display their logos in recipient inboxes, reinforcing brand trust and reducing phishing risks. It works in conjunction with DMARC, SPF, and DKIM to ensure that only authenticated emails showcase the brand logo.
🔑 Key Benefits:
✅ Enhanced brand recognition 📢
✅ Improved email open rates 📈
✅ Stronger phishing protection 🛡️
✅ Better email engagement ✉️
How BIMI Works ⚙️
BIMI relies on DNS records and Verified Mark Certificates (VMCs) to validate and display logos.
The process follows these steps:
1️⃣ Email is sent with SPF, DKIM, and DMARC authentication.
2️⃣ Mailbox providers check BIMI DNS records.
3️⃣ If valid, the logo is fetched and displayed in the email client.
4️⃣ If authentication fails, the email is delivered without the logo.
📌 Example BIMI Flow:
[Your Company] → [DMARC Authenticated] → [BIMI Lookup] → [Logo Displayed] ✅ [Your Company] → [DMARC Failed] → [No BIMI Display] ❌
Setting Up BIMI for Your Domain 🛠️
1️⃣ Create a BIMI-Compliant Logo 🎨
- Format: SVG (Tiny Portable/Secure Profile SVG 1.2)
- Size: Square, < 32KB
- No background or transparency
2️⃣ Host Your Logo 📂
Upload your SVG logo to a publicly accessible HTTPS endpoint.
Example URL:
https://yourdomain.com/logo.svg
3️⃣ Generate a BIMI DNS Record 📡
Add a TXT record in your DNS settings:
default._bimi.yourdomain.com IN TXT "v=BIMI1; l=https://yourdomain.com/logo.svg; a=https://yourdomain.com/vmc.pem"
📌 Breakdown:
v=BIMI1;→ Specifies BIMI versionl=...;→ Logo URLa=...;→ Optional Verified Mark Certificate (VMC) URL
4️⃣ Get a Verified Mark Certificate (VMC) 🔏
Some mailbox providers (e.g., Gmail) require a VMC to validate your BIMI record.
- Issued by: DigiCert, Entrust
- Cost: Paid service (~$1000/year)
- Validation: Ensures logo authenticity
5️⃣ Test Your BIMI Implementation 🛠️
Use BIMI lookup tools to verify the record:
Example Code for BIMI DNS Record 🔄
1️⃣ Using Bind9 DNS Server
$ sudo nano /etc/bind/zones/db.yourdomain.com
Add the following TXT record:
default._bimi.yourdomain.com. IN TXT "v=BIMI1; l=https://yourdomain.com/logo.svg; a=https://yourdomain.com/vmc.pem"
2️⃣ Using Cloudflare DNS
-
Navigate to
DNS Settings -
Click
+ Add Record -
Select
TXT→ Enter the following:- Name:
default._bimi - Content:
- Name:
v=BIMI1; l=https://yourdomain.com/logo.svg; a=https://yourdomain.com/vmc.pem
Save & Apply ✅
Verifying BIMI Setup ✅
1️⃣ Check via Dig Command
dig +short TXT default._bimi.yourdomain.com
📌 Expected Output:
"v=BIMI1; l=https://yourdomain.com/logo.svg; a=https://yourdomain.com/vmc.pem"
2️⃣ Check Email Authentication
Send a test email and check the headers for Authentication-Results:
Authentication-Results: dmarc=pass header.from=yourdomain.com BIMI-Selector: default BIMI-Verified: PASS
BIMI Support: Who Uses It? 🤝
| Email Provider | BIMI Support | VMC Required? |
|---|---|---|
| Gmail | ✅ Yes | ✅ Yes |
| Yahoo Mail | ✅ Yes | ❌ No |
| Apple Mail | 🚧 Testing | ✅ Yes |
| Outlook | 🚫 No | 🚫 No |
| Fastmail | ✅ Yes | ❌ No |
🚀 Pro Tip: If your provider doesn’t support BIMI, implement DMARC anyway to protect your domain.
Common BIMI Issues & Fixes 🛠️
🔴 Issue: Logo not displaying ✅ Fix: Ensure DMARC policy is at least p=quarantine or p=reject.
🔴 Issue: VMC required error ✅ Fix: Purchase and link a Verified Mark Certificate (VMC).
🔴 Issue: BIMI DNS record not resolving ✅ Fix: Verify DNS propagation using:
dig +short TXT default._bimi.yourdomain.com
Conclusion 🎯
BIMI is not just about branding—it’s about email trust, security, and authenticity. By implementing BIMI alongside SPF, DKIM, and DMARC, businesses can enhance their reputation, increase engagement, and reduce phishing risks. 🚀
Ready to Deploy BIMI?
Start by configuring DMARC with YourDMARC and boost your brand’s email presence today! 🔥
💡 Need Help? Contact YourDMARC Support for seamless integration! 🤝
