KLAVIYO ELITE PARTNER · EMAIL DELIVERABILITY

The Email Deliverability Agency for DTC Brands That Want Their Emails Back in the Inbox

Deliverability isn’t an IT problem. It’s a revenue problem - when sender reputation breaks, every flow, campaign, and winback dies in spam before it can earn. We audit, repair, and protect it inside Klaviyo - the platform your revenue already runs on.

Klaviyo Elite Partner
EMEA RANK#1
GLOBAL TIER0.0025%
FOCUSLTV
As featured in
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CASE STUDY · HEIGHTS DOMAIN MIGRATION

A Full Domain Migration. Zero Deliverability Disruption.

Heights outgrew yourheights.com. Moving an entire email program to a new domain is where most brands break flows, tank sender reputation, and lose revenue. YOCTO ran the whole migration - infrastructure, a 30-day staggered warmup, and a post-switch audit - with zero inboxing issues and a domain reputation strong enough to scale.

Read the full case study
0
inboxing issues through the switch
30-day
staggered reputation warmup
Full
flows, infra & audit handled
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Javvy email campaign designed by YOCTO
Javvy
Javvy email campaign designed by YOCTO
Javvy
FlavCity email campaign designed by YOCTO
FlavCity
FlavCity email campaign designed by YOCTO
FlavCity
Heights email campaign designed by YOCTO
Heights
Heights email campaign designed by YOCTO
Heights
Heights email campaign designed by YOCTO
Heights
Gratsi email campaign designed by YOCTO
Gratsi
Gratsi email campaign designed by YOCTO
Gratsi
Mira email campaign designed by YOCTO
Mira
Mira email campaign designed by YOCTO
Mira
Wavy email campaign designed by YOCTO
Wavy
Wavy email campaign designed by YOCTO
Wavy
Zapply email campaign designed by YOCTO
Zapply
Zapply email campaign designed by YOCTO
Zapply
Bliss email campaign designed by YOCTO
Bliss
Bliss email campaign designed by YOCTO
Bliss
Pharmacy Online email campaign designed by YOCTO
Pharmacy Online
Pharmacy Online email campaign designed by YOCTO
Pharmacy Online
ELEAT email campaign designed by YOCTO
ELEAT
ELEAT email campaign designed by YOCTO
ELEAT
The Sprouting Company email campaign designed by YOCTO
The Sprouting Company
The Sprouting Company email campaign designed by YOCTO
The Sprouting Company
Workout Meals email campaign designed by YOCTO
Workout Meals
Workout Meals email campaign designed by YOCTO
Workout Meals
Plateful email campaign designed by YOCTO
Plateful
Plateful email campaign designed by YOCTO
Plateful
Elavate email campaign designed by YOCTO
Elavate
Elavate email campaign designed by YOCTO
Elavate
Frøya Organics email campaign designed by YOCTO
Frøya Organics
Zephyrian email campaign designed by YOCTO
Zephyrian
WHY YOUR EMAILS MISS THE INBOX

Your List Didn’t Stop Caring. Your Emails Stopped Arriving.

Deliverability failures are invisible by design - Gmail doesn’t send you a note when it starts routing you to spam. When revenue-per-send slides, it’s almost always one of these.

PROBLEM 01▲ LEAK

Your opens halved and nobody can tell you why.

One month your campaigns did 40% opens. Now they do 15%. And your agency’s answer is ‘try a different subject line.’ The problem isn’t the copy. It’s where the email lands.

PROBLEM 02▲ LEAK

Gmail buries you in Promotions. Yahoo buries you in spam.

Your best customers aren’t ignoring you - they’re not seeing you. And once complaint rates cross Google’s 0.3% ceiling, the slide from Promotions to spam is fast and quiet.

PROBLEM 03▲ LEAK

Your wellness claims trip filters your agency has never heard of.

Supplements, beauty, femtech - words that are fine on your website get your emails junked. The filter won’t tell you which ones. Your open rate will, three months late.

PROBLEM 04▲ LEAK

Shared pool or dedicated domain? You’re guessing.

Klaviyo gives you three levers - shared IP pools, its shared klaviyomail.com domain, or a branded sending domain of your own. The right one depends on volume and history, and guessing wrong costs months of reputation.

PROBLEM 05▲ LEAK

Microsoft now rejects unauthenticated senders. Outright.

Since May 2025, Outlook and Hotmail bounce non-compliant bulk senders with a 550 error - not spam-folder them, reject them. If your SPF, DKIM, and DMARC setup predates the rule, part of your list is simply unreachable.

PROBLEM 06▲ LEAK

Your ‘engagement’ is part bots, part ghosts.

Bot clicks inflate your metrics while dead addresses drag your reputation down. You’re making sending decisions on data that lies to you.

Recognize a few? That’s where the free audit starts.
Request a Free Audit
WHAT WE DO

Deliverability, Fixed Where Your Revenue Lives: Inside Klaviyo.

Generic deliverability consultants hand you a PDF and leave. We fix sender reputation inside the same flows and campaigns that make you money - because inbox placement isn’t the goal. Repeat revenue is.

FIG.01 - THE DELIVERABILITY SYSTEM A · R · P I AUDIT INPUT 01 II REPAIR INPUT 02 III PROTECT INPUT 03 REVENUE PER SEND REPEAT REVENUE 3 INPUTS · ONE SYSTEM
INPUT 01I

Deliverability Audit & Diagnosis

A full teardown: SPF, DKIM, and DMARC alignment, sender reputation, placement testing, list-quality forensics, and a Klaviyo infrastructure review - shared pool or dedicated domain, answered with data instead of guesswork.

INPUT 02II

Repair & Warm-up

The audit’s fix list, executed in order: authentication repairs, domain and IP warm-up sequencing, suppression strategy, and content-filter fixes for regulated verticals like supplements and wellness.

INPUT 03III

Protection & Monitoring

Deliverability doesn’t stay fixed on its own. Sending-cadence design (smart sending), complaint-rate management under Gmail’s 0.3% ceiling, and ongoing placement monitoring - built into your retention program, not sold back to you as a separate tool.

Your Free Audit Is a Complete Gameplan, Not a Sales Call.

Most agencies sign you, then disappear for eight weeks to “audit” before they tell you anything. We do the opposite. Before you pay a cent - before you even decide - you get a full teardown of your account and the exact plan to fix it, built from your real numbers. Here’s what lands in your inbox.

01
UNIT ECONOMICS

A Full Unit Economics Analysis

We pull your real numbers from Shopify and Klaviyo - margins, breakeven, retention order by order, and the most you can spend to acquire a customer without losing money. You see exactly where the business makes money and where it leaks.

02
GROWTH LEVERS

Every Growth Lever, Mapped

The full set of levers that move LTV - converting one-time buyers to subscription, cutting voluntary and failed-payment churn, reactivating cancellers, lifting subscription AOV. You see which ones actually move the needle.

03
SCORECARD

A Prioritized Lifecycle Scorecard

A flow-by-flow benchmark of your current program - what’s working, what’s broken, what’s missing - scored against brands like yours and ranked by revenue impact. A number, and a reason.

04
THE GAMEPLAN

The Complete Gameplan

One prioritized roadmap - which flows to fix, kill, or build, which subscriber segments to split out, and which subscription levers to pull, in order, with targets and trajectory. Not a 40-page deck. A plan you can start tomorrow.

All built from your live Klaviyo, Shopify, and subscription data - never a template.

Subject to availability

Named Clients. Real Numbers.

BetterMeHEALTH · LIFECYCLE
+0%
Email & SMS revenue, built from scratch
CASE FILEREAD →
Zapply UKSUBS · CPG · LIFECYCLE
+0%
Quarterly growth from the subscription engine
CASE FILEREAD →
GratsiCPG · LIFECYCLE
+0%
Revenue lift across a 500K+ list
CASE FILEREAD →
ECUALAMALIFECYCLE · OTHER
+0%
Lifecycle revenue through BFCM, on 45% fewer emails
CASE FILEREAD →
MiraCareSUBS · HEALTH
+0%
Loyalty redemption up, churn cut ~14%
CASE FILEREAD →
Boujee HippieCPG · LIFECYCLE
+0%
Revenue up, messaging costs down 34%
CASE FILEREAD →
ColonBroomSUBS · HEALTH · LIFECYCLE
$1M/wk
Email revenue, sustained
CASE FILEREAD →
MiraHEALTH · LIFECYCLE
+252%
Email revenue
CASE FILEREAD →
DandelionCPG · LIFECYCLE
+370%
Revenue on flows
CASE FILEREAD →
Vital NutritiveHEALTH · LIFECYCLE
+368%
Revenue in 4 months
CASE FILEREAD →
MammutmarschLIFECYCLE · OTHER
+337%
Campaign revenue
CASE FILEREAD →
HealfCPG · LIFECYCLE
5×
Email revenue
CASE FILEREAD →
EveredenSUBS · CPG · LIFECYCLE
+110%
Year-over-year growth
CASE FILEREAD →
Jimmy JoyCPG · LIFECYCLE
+94.9%
Revenue growth
CASE FILEREAD →
PopupLIFECYCLE · OTHER
+93%
Rebuy-rate increase
CASE FILEREAD →
Red RavenLIFECYCLE · OTHER
57.75×
Email ROI
CASE FILEREAD →
Pandia HealthHEALTH · LIFECYCLE
4×
Email conversions
CASE FILEREAD →
HeightsCPG · LIFECYCLE
+38%
Win-back recovered, +46% upsell
CASE FILEREAD →
FrøyaSUBS · CPG · LIFECYCLE
−33%
Subscription churn cut
CASE FILEREAD →
MoérieCPG · LIFECYCLE
+32%
Email conversion in 5 days
CASE FILEREAD →
MyooviSUBS · HEALTH · LIFECYCLE
+44%
Revenue from email in 60 days
CASE FILEREAD →
SWAYLIFECYCLE · OTHER
−67%
CRM costs cut
CASE FILEREAD →
George Kapernaros, Founder & CEO of YOCTO
George Kapernaros
FOUNDER · CEO · YOCTO

The Founder Does the Diagnosis

George Kapernaros founded YOCTO to do one thing better than anyone else: turn DTC retention into a measurable system. He sits on the Klaviyo Partner Advisory Council, the Forbes Business Council, and the Fast Company Executive Board - and he personally runs the audit on every account before a single deliverable is complete.

Klaviyo Partner Advisory CouncilForbes Business CouncilFast Company Executive Board

The Videos Other Agencies Use to Train Their Staff

George Kapernaros on retention - video 1
RETENTION AS A SYSTEM · 01
George Kapernaros on retention - video 2
THE SUBSCRIPTION LEAK · 02
George Kapernaros on retention - video 3
WHAT THE AUDIT FINDS · 03
FAQ

Email Deliverability Questions, Answered.

What does an email deliverability agency actually do?
We diagnose why your emails miss the inbox, fix it, and keep it fixed - authentication, sender reputation, list quality, content filters, and sending strategy. The difference with us: we do it inside Klaviyo, wired into the flows and campaigns that drive your revenue - not as standalone email deliverability services that end with a PDF.
Why are my Klaviyo emails going to spam?
Usually one of four things: authentication that doesn’t align (SPF, DKIM, DMARC), a complaint rate creeping toward Google’s threshold, list decay feeding spam traps, or content tripping filters - especially common for wellness and supplement claims. The audit tells you which. (Want to run the checks yourself first? Our step-by-step Klaviyo deliverability audit guide walks through all four.) Guessing rotates subject lines while your reputation burns.
How much does an email deliverability audit cost?
Market rate for a standalone audit is $1,000-$5,000. Ours is included in the free audit we run for every prospective client - a complete deliverability teardown inside the full retention gameplan. We’d rather show you what’s broken than charge you to find out.
What are the Gmail and Yahoo bulk-sender requirements - and do they apply to my brand?
Send 5,000+ emails a day to Gmail and you’re a bulk sender - permanently. The requirements: SPF and DKIM, an aligned DMARC policy, one-click unsubscribe honored within two days, and complaints kept below 0.1% - Google’s stated guideline - never allowed to reach the 0.3% line where blocking starts. Microsoft has enforced its own version since May 2025, by rejecting non-compliant mail outright. Most DTC brands qualify without realizing it.
Do I need DMARC to send with Klaviyo?
If you send 5,000+ emails a day to Gmail, yes - an aligned DMARC policy (at least p=none) is mandatory, and Klaviyo can’t set it for you. Klaviyo signs DKIM on your branded sending domain, but DMARC lives in your DNS. Klaviyo deliverability starts at your domain records - it’s the first thing our audit checks.
Should I use a dedicated sending domain or Klaviyo’s shared infrastructure?
Below bulk-sender scale, Klaviyo’s shared infrastructure is often safer than a cold dedicated domain. At 5,000+ emails a day, a branded sending domain stops being optional - Gmail’s and Microsoft’s alignment rules effectively require it - and the warm-up is the price of admission. We’ve run both migrations - including a domain migration for Heights with zero deliverability disruption.
How long does it take to fix email deliverability?
Authentication fixes: days. Reputation recovery: two to eight weeks, on a disciplined warm-up schedule - Gmail forgives, slowly. Anyone promising overnight inbox placement is usually selling an IP-rotation trick that performs worse in month two.
What is a good email deliverability rate?
Ignore the ‘delivered’ percentage - mail routed to spam still counts as delivered, so 99% tells you nothing about placement. The numbers that predict revenue: complaint rate under 0.1%, opens tracked by mailbox provider, and revenue-per-send holding steady. If ‘delivered’ reads 99% while revenue-per-send falls, that’s the audit’s opening question.
Can you fix emails landing in the Gmail Promotions tab?
Sometimes - and we’ll be straight about the limits. Promotions is classification, not punishment - plenty of DTC brands make excellent money there. Spam is the emergency. We fix spam first, then optimize toward Primary where content and engagement genuinely allow it.
Do supplement and wellness brands have special deliverability problems?
Yes - it’s most of what we see. Health claims trip content filters, aggressive winbacks meet tired lists, and compliance language fights conversion copy. It’s why our roster is supplements, wellness, beauty, and femtech: Healf, ColonBroom, Frøya Organics, BetterMe, Myoovi. Generalist agencies pay that tuition with your domain. We paid it years ago.

Bring Us Your Hardest Retention Problem.

We take on a fraction of the brands that apply - the ones we know we can move the needle for.