SignumeBlog
Guides on BIMI, VMC & email trust
Practical, accurate guides on getting your logo, and Gmail's checkmark, into the inbox.
Verified Check Mark vs. Verified Badge: What Each One Proves
Social media badges prove account status, but the Gmail verified checkmark evaluates every single email in real time. Here is why message-level verification matters for brands.
BIMI Dark Mode Guidelines: How to Format Your SVG Logo
Mailbox providers render BIMI logos across light and dark themes. Here is how to format your SVG Tiny PS logo to prevent dark mode background issues.
BIMI for Transactional Email: Boost Open Rates on Critical Messages
Transactional emails carry critical operational data like password resets and invoices. Here is how adding BIMI logo verification protects customer communication.
BIMI Requirements Checklist: Everything You Need to Qualify
A complete step-by-step checklist to prepare your domain for BIMI, VMC verification, and displaying your logo with the blue checkmark in email clients.
The VMC Validation Process: What to Expect Step-by-Step
A practical guide to the verification steps required by Certificate Authorities during VMC issuance, from identity checks to notary calls.
BIMI in Apple Mail: Branded Mail vs a VMC
Apple Mail supports BIMI with a VMC, and separately runs its own Branded Mail program. Here is what each one actually does, and why they are not interchangeable.
CMC vs VMC: Which Do I Need?
Both certificates put your logo in the inbox. Only one earns Gmail's checkmark and works with Apple Mail. Here is how to decide between a CMC and a VMC.
Does Outlook Support BIMI?
Not for standard inbound mail, as of 2026. Here is what Microsoft actually does instead, why a VMC still isn't wasted on an Outlook-heavy list, and what to watch for.
BIMI, VMC & CMC: Which Email Providers Show Your Logo (and the Checkmark)?
Not every inbox treats BIMI the same. Here's which providers show your brand logo, which add Gmail's blue checkmark, and which show nothing at all in 2026.
BIMI vs VMC: What Is the Difference?
BIMI is the standard that tells inboxes where to find your logo. A VMC is the certificate that proves the logo is yours. Here is how the two fit together.
Do VMCs Improve Email Deliverability?
A VMC is not a deliverability signal in itself, but getting one usually improves deliverability anyway. Here is the honest explanation of why, and what to expect.
Does an EU or UK Trademark Work for a VMC If You Email Globally?
A common worry: my trademark is only registered in the EU or UK, but I email the whole world. Will my VMC still work everywhere? The short answer is yes. Here's why.
Is a Registered Trademark Required to Get a VMC?
Yes. A VMC requires a registered trademark from an accepted office. Here is what counts, what does not, and what to do if your mark is pending or missing.
Can One VMC Cover Multiple Domains and Subdomains?
One VMC covers one logo, but it can protect several domains and subdomains. Here is how coverage works, and when you genuinely need a second certificate.
What Are the Technical Requirements for a VMC?
SPF, DKIM, DMARC at enforcement, a square SVG Tiny P/S logo, and a BIMI DNS record. Here is every technical prerequisite for a VMC, and where projects stall.
VMC vs Gmail's Blue Checkmark: What Is the Difference?
The VMC is the certificate. The blue checkmark is what Gmail shows because you hold one. Here is how they relate, and why a CMC never earns the checkmark.
What Is a VMC (Verified Mark Certificate) and How Do You Get One?
A Verified Mark Certificate puts your trademarked logo, and Gmail's blue checkmark, in the inbox. Here's what a VMC is, what it requires, and how to get one.
Why Is DMARC Enforcement Mandatory for BIMI and a VMC?
No inbox will show your logo while your domain sits at p=none. Here is why DMARC enforcement is non-negotiable for BIMI, and how to reach it without losing mail.