Display your Brand Logo Next to Your Emails and Boost Open Rates
DigiCert Common Mark Certificate (CMC)
Enhanced Brand Recognition & Email Open RatesCommon Mark Certificate (CMC) is a very innovative digital certification that enhances the security and integrity of email communications with organizations availing additional value and security to their mail systems. DigiCert Common Mark Certificates (CMC) helps brands to display the symbol of an email message sender to identify them better. Hence, the recipient of your email will see your company's logo even before opening the actual message.
Display Your Brand Logo Next to the “Sender” Field in Client’s Emails and Boost User Trust
With increased cases of cyber threats and rogue schemes, the modern customer does not want to risk anything. With CMC now in place, you can protect your customers and brand against Phishing, Spoofing and Business Email Compromise (BEC) Attacks.
Common Mark Certificates (CMCs) give companies the ability to brand their outgoing emails by placing a brand logo in the sender field; certify the DMARC status of the company and its verified identity; and help protect against phishing and spoof attacks. They are like Verified Mark Certificates (VMCs) but do not require a registered trademark for use, thus allowing for a wider range of senders to add that extra layer of security to their emails while providing assurance to their recipients that the emails originate from a legitimate source.
The only requirement to get the CMC is that the logo that has been put to use should be more than one year or Modified Registered trademark.
Trusted by World Leading Brands
Leading Enterprises use DigiCert Mark Certificates, BIMI, and DMARC to Increase Inbox Trust










Common Mark Certificate Features
- BIMI-DMARC Compliant Solution
- High-assurance Business Validation
- Supported by Gmail, Microsoft, Yahoo, etc.
- Unlimited Certificate Reissues
- Enhances Brand Visibility in Emails
- Higher Email Open Rate
- 1 Verified Logo per Certificate
- Display Verified Company Logo
- Add up to 250 domains
Benefits of Common Mark Certificates for BIMI
Boost Email Open Rates
CMCs do improve open rates with the addition of trust and authenticity to your email communication. By including a verified company logo, you can soothe recipients that the communication is legitimate, thus keeping them engaged.
Enhanced Brand Recognition
By displaying the recipient's inbox with your company-recommended logo, CMCs are showcasing brand visibility and recognition. This consistency reinforces branding successfully, thus establishing your business in the eyes of your audience.
Increase in Email Deliverability
As CMCs stick to BIMI and DMARC compliance, there's a better chance that the email will stay out of spam and land right into the recipient's inbox. It guarantees improved deliverability of mail and therefore better communication.
Add up to 250 domains
Organizations with several domains can streamline their email branding efforts by combining up to 250 domains under a single Common Mark Certificate (CMC). This flexibility is ideal for businesses with a wider range of email operations.
Display Verified Company Logo
Common Mark Certificates allow one to place one’s verified logo at prominent positions in the supported email clients, thus amplifying trust and professionalism and then boosting user engagement.
Easier to Obtain
With Common Mark Certs, implementing BIMI no longer requires trademarking your logo. This streamlined process makes CMCs significantly easier to obtain and hassle-free.
How To Get Ready for CMC?
Follow the below rules to prepare yourself for a CMC:
- Be DMARC Compliant: The DMARC record for your domain must be compliant and set to "p=quarantine" or "p=reject."
- Use Your Logo Consistently: The logo should show proof of use on the website for at least 12 consecutive months. This is to assure brand affiliation.
- No Trademark Required: A CMC does not necessarily require a registered trademark. However, if you are using a trademarked logo, consider DigiCert Verified Mark Certificates (VMCs) to avail more benefits.
- Format Your Logo: The logo must be BIMI Compliant SVG Image File format and properly sized to meet display standards.
- Purchase the CMC: Purchase Common Mark Cert from CA or Reseller and after that CA will validate all your organization details and issue your certificate if all requirements will be met successfully.
- DNS Records Update: After the issuance of the CMC, a DNS record must be updated, showing a BIMI record with a link to your confirmed logo.
- Automatic Display of Logos: The verified logo will automatically appear in Gmail email clients and any other supporting BIMI platform. (Currently supported by only Gmail).

How Many CMCs Do you Need?
Every organization has its own distinct email and domain configurations. One Common Mark Certificate is sufficient for a single email domain and logo. One CMC is still sufficient for multiple email domains with a single logo. But regardless of email domains, if you have multiple logos, each one will require its own CMC.
The chart below outlines different organizational structures and their CMC requirements.
Organization Structure | Number of Logos | Number of CMCs |
---|---|---|
Single domain | One | One |
Single domain | Multiple | Multiple: One CMC per logo |
Multiple domains | One | One |
Multiple subdomains | One | One |
Multiple domains | Multiple | Multiple: One CMC per logo |
Multiple subdomains | Multiple | Multiple: One CMC per logo |
A few sample cases and the necessary number of CMCs will help us understand it.
- Multiple email domains such as (@domain1.com and @domain2.com) with a single logo: Just one CMC
- Multiple email subdomains with unique addresses such as (@mail.domain1.com, @shop.domain1.com) and a single logo: One CMC
- Multiple local subdomains under the same domain(@brand1.domain1.com, @brand2.domain1.com) each having its logo: One CMC per local subdomain
- Multiple emails with the same second-level domain, but with different suffixes for each email domain(@domain1.com, @domain1.net, @domain1.org) if the logo is the same across all domains, one CMC; if the logos are different for each domain, distinct CMCs.
Frequently Asked Questions
Have Questions? We're here to help.
What are Common Mark Certificates?
With a CMC, one gets the logo next to the email in the inbox prior to it being opened by the recipient. This serves to confirm your status as DMARC and declare your organization’s authenticated identity.
What is the Difference between a Common Mark Certificate and a Verified Mark Certificate?
The biggest difference is that CMCs don't have to bear trademarked logos, whereas VMCs should. However, a CMC user will never get Google's blue check mark. A VMC's logo must match in its entirety with the trademark databases, while a CMC provides for slight logo changes.
What is Google’s Recent BIMI Changes?
Google has announced that BIMI support will no longer require trademarks; a Common Mark Certificate will do if the logo is in use for one year. The compatibility of BIMIs increases from mobile to desktop with either a CMC or VMC; therefore, the blue checkmark from Google expands beyond webmail platforms into mobile ones (for VMC only).
Which Inbox Providers support CMC or VMC?
At this time, CMCs are supported by Google (Gmail) only, whereas VMCs can be recognized by such service providers as Gmail, Yahoo, Outlook, Apple, Fastmail, and Valimai. This difference stresses that VMCs are being more widely used among most email service providers and better serve the purpose of email branding and safety.
What are the Requirements for Obtaining a CMC?
To obtain a CMC, make your domain DMARC-compliant with either p=quarantine or p=reject, and consistently use an SVG logo for 12 months. Verify this with a Certificate Authority like DigiCert and then update your DNS records by linking the BIMI logo to your certificate so that email clients that support BIMI can display it.
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