5 Real-World BIMI Case Studies That Prove Trust Drives Engagement

Marketers love numbers.

Security teams love evidence.

BIMI gives you both.

Brand Indicators for Message Identification (BIMI) turns your verified logo into a trust signal in the inbox — but does it really move the needle on engagement?

Short answer: yes.

Long answer: let’s look at the data.

Below are five real-world BIMI case studies and data points — from SaaS companies to global banks — that show how verified logos boost opens, clicks, and confidence.

1) Tallyfy: From “good” transactional emails to +80% higher CTR

Workflow platform Tallyfy is one of the most frequently cited BIMI success stories.

Working with Red Sift and Entrust, they implemented BIMI with a Verified Mark Certificate (VMC) so their trademarked logo would appear next to transactional emails in the inbox.

The results?

• Their click-through rates on transactional emails settled between 15–25%,

• compared to an industry average of around 10% CTR for transactional email.

That represents up to an 80% increase in CTR.

Beyond the numbers, Tallyfy’s CEO, Amit Kothari, describes BIMI as an “incredible strategic investment” that boosted brand awareness and confidence in the Tallyfy trademark, putting them “on par with the security standards of Fortune 500 organizations.”

What this shows:

BIMI isn’t just a visual polish. For brands with strong lifecycle and transactional email flows, a trusted logo directly drives more actions on high-intent messages.

2) TalkTalk: 4–6% open rate gains that would normally cost a fortune

Telecoms and broadband provider TalkTalk also deployed BIMI and shared its impact publicly.

In Red Sift’s BIMI case studies, TalkTalk’s Head of Customer Security explains that BIMI produced a 4–6% uplift in open rates, and that email marketing teams normally spend “so much money” just to gain 2–3% more opens.

In other words:

• BIMI helped TalkTalk double the kind of uplift they’d be thrilled to get from traditional email optimisation —

• without changing subject lines, send times, or content.

What this shows:

For high-volume senders, even a few percentage points of improvement in open rate translate into:

• more customers reached,

• more conversions,

• better utilisation of existing lists.

And BIMI’s uplift stacks on top of what you’re already doing in marketing.

3) Bank of America & other major brands: BIMI as a visible trust standard

When Gmail officially rolled out BIMI support in 2021, Bank of America was highlighted as one of the launch partners.

Since then, BIMI has been adopted by a wide range of large brands:

• major financial institutions,

• retailers,

• news and media organisations,

• tech and SaaS companies.

While Bank of America hasn’t published a detailed uplift report, its early adoption is telling: this is a sector that invests heavily in fraud prevention, reputation and customer trust. The bank’s own documentation describes BIMI as a way to add “an additional layer of email authentication that helps build users’ trust” in email communications.

In other words, BIMI is not just a marketing play for them; it is part of their overall digital trust posture.

What this shows:

When conservative, risk-sensitive organisations like large banks adopt a new email standard, it’s usually because:

• it increases recipient confidence,

• it supports anti-phishing and DMARC strategies,

• and it reinforces their brand as a safe counterpart.

That’s exactly where BIMI lives.

4) Red Sift & Entrust: 1,026 consumers, 3 key metrics

Not all case studies are tied to a single brand.

Some look at consumer behaviour across many brands.

A widely cited study from Red Sift and Entrust surveyed 1,026 participants across the US and UK to measure how logo visibility (enabled by BIMI) affects interaction with email.

Their findings are some of the strongest publicly available data on BIMI:

• Up to 39% increase in email open rates,

• Up to 32% increase in purchase likelihood,

• Up to 120% improvement in brand recall, especially for stronger brands.

These results were observed across both transactional and promotional emails, and for brands of various sizes.

What this shows:

Even outside a single-company case study, the pattern is consistent:

• a verified, visible logo in the avatar slot makes people more likely to open, remember, and buy.

• the effect is particularly strong among younger, more digitally native demographics.

If your strategy targets Millennials or Gen Z, BIMI isn’t optional; it’s a future-proofing move.

5) Adoption at scale: from niche experiment to mainstream trust signal

You can also treat global adoption itself as a kind of “macro case study”.

Email veteran Al Iverson analysed BIMI adoption among the top 10 million domains and found that domains with a BIMI record grew from 14,305 in June 2023 to 21,222 in June 2024 — a jump of roughly 48% in a year.

At the same time:

• Major mailbox providers such as Google (Gmail), Apple, Yahoo, Fastmail, La Poste and others now support BIMI.

• A Validity analysis of 13,000 domains found that only 4.57% had valid BIMI records, with another ~4.6% having invalid ones — meaning the field is still very open for early movers.

This creates a strategic asymmetry:

• Most of the infrastructure now supports BIMI,

• but only a small minority of brands have implemented it properly.

What this shows:

BIMI is moving from “pilot” to quiet competitive advantage:

• If your brand adopts BIMI now, you stand out visually while competitors still send “anonymous” emails.

• As BIMI adoption grows, the absence of a verified logo could become a negative signal — just like browsing a website without HTTPS today.

What all these case studies have in common

Looking across these five examples, a few patterns emerge:

1. Trust is visual.

   Seeing a logo where you expect one (and not seeing it where you don’t) helps users make quick, intuitive judgments about legitimacy.

2. Engagement improves at multiple points.

   BIMI doesn’t only improve open rates; it also boosts clicks, brand recall, and purchase intent.

3. BIMI forces better email hygiene.

   To show your logo, you need proper SPF, DKIM and a strong DMARC policy (quarantine or reject). That improves your overall deliverability and reduces spoofing.

4. The ROI compounds over time.

   Every campaign with a verified logo strengthens recognition and trust, which naturally feeds into lifetime value — especially for recurring or subscription-driven businesses.

How Bimimi.io fits into this picture

All of these case studies have one thing in common:

none of them happened by “accident”.

They required:

• authenticated sending domains (SPF, DKIM, DMARC),

• a BIMI-compliant SVG logo,

• a VMC or CMC from a trusted Certificate Authority,

• and a correctly published BIMI DNS record.

At Bimimi.io, we exist to make that process as simple and predictable as possible:

• We help you prepare and validate your DMARC posture.

• We convert and validate your logo to meet BIMI’s strict SVG Tiny PS requirements.

• We work vendor-agnostically with DigiCert, GlobalSign, and SSL.com to obtain the right VMC or CMC for your brand.

• We guide you through DNS publication, testing, and ongoing maintenance.

So you can focus on the result:

--> more opens,

--> more clicks,

--> and more trust — visible in every inbox.

Ready to write your own BIMI case study?

If you’d like your next email success story to include “+20–40% opens” or “+80% CTR” with a clear trust narrative behind it, BIMI is one of the most leverage-rich changes you can make.

🔗 Start your BIMI journey with Bimimi.io and turn your logo into a proven engagement driver.