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Klaviyo deliverability, fixed and kept healthy

Deliverability decides if your emails reach the inbox or spam. Here's what it comes down to, and how we keep yours healthy.

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30-day guarantee
$8,000,000+ in email revenue driven by data-driven strategies
Email health

Six things that decide where your emails land

Gmail, Outlook and Yahoo judge every sender on the same signals. Get these right and the inbox follows.

Authentication

Prove the email is really from you

SPF, DKIM and DMARC tell mailboxes your domain sent it. Without them, you look like a spammer.
Inbox placement

Know where your emails actually land

Opens won't tell you about spam. A seed test shows inbox or spam at every mailbox.
Spam complaints

Keep complaints under 0.1%

Every report-spam click counts against you. Past 0.3%, Gmail starts filtering you out.
List health

Stop mailing people who've gone quiet

Profiles that never open drag your reputation down. Sending less to them lifts everyone else.
Sender rules

Meet Gmail and Yahoo's rules

One-click unsubscribe, an aligned domain and low complaints are now required for bulk senders.
Sending rhythm

Send steadily, not in spikes

Sudden jumps in volume look like spam. A steady schedule, warmed up over time, keeps your reputation stable.

Sign with us and all of it comes off your plate. We set it up, fix what's broken and keep watching it, every week, so your emails stay in the inbox:

Set up SPF, DKIM and DMARC
Add BIMI, your logo in the inbox
Seed test where every send lands
Watch spam complaints every week
Sunset people who've gone quiet
Clean bounces and bad addresses
Warm up new domains and senders
Keep your sending volume steady
Add one-click unsubscribe
Check every email for spam triggers
Monitor the blocklists
Report it all monthly in PRISM
Book a call
How we optimise

Beyond the fix: what we tune every week

Every email that lands in spam is revenue you never see. These keep your sender reputation climbing, so more of every send reaches the inbox.

Sending by engagement

Your most engaged profiles get every send; quieter ones get fewer, so mailboxes see a list that opens.

Placement by mailbox

Gmail, Outlook and Yahoo judge you separately. We track each one and fix the one that slips.

Reputation, week by week

Your domain's reputation in Google Postmaster Tools, checked every week, so a drop is caught before it spreads.

Re-engagement before sunset

A last-chance flow wins back some of the quiet ones before we stop mailing them.

One frequency cap

Campaigns and flows share one cap, so no one gets so much they reach for the spam button.

Clean sign-ups

Sign-up forms checked for bots and typos, so bad addresses never reach your list.

Content that lands

Image weight, link domains and spammy wording checked before every send.

Your own sending domain

Emails send from your own branded domain, so the reputation you build is yours alone.
How we keep it healthy

Fix it once, then keep watching

Step 1

Find what's wrong

We check all six, from your domain's records to who you're still sending to.
Step 2

Fix it in order

Authentication first, then the list, then the sending rhythm, so nothing breaks along the way.
Step 3

Watch every send

PRISM tracks placement, complaints and engagement, and flags a slip before it costs you.

FAQs

Can't find your answer? Book a call

What is email deliverability?

Whether your emails reach the inbox. It's different from delivery: an email can be delivered and still land in spam.

Why are my emails going to spam?

Usually one of six things: missing authentication, high complaints, mailing inactive profiles, sudden volume spikes, breaking Gmail and Yahoo's rules, or content that looks like spam.

What's a good spam complaint rate?

Under 0.1%. Google's hard line is 0.3%: above it, your emails get filtered or rejected.

Do I need SPF, DKIM and DMARC?

Yes. Since 2024 Gmail and Yahoo require all three from bulk senders. Klaviyo sets up part of it; the rest sits in your domain's settings.

How often should I clean my list?

Keep mailing engaged profiles, and move anyone who hasn't opened or clicked in about 90 days into a sunset flow before you stop sending to them.

Can you check mine?

Yes. Book a free audit and we'll check all six, then show you what to fix first.

Find the money in your emails

No guesswork. $50k–$500k more email revenue a month in 30 days or less, or your money back.

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© 2026 Tornado Digital Group Ltd. Registered in England and Wales, company no. 14014279.
Email designs shown are examples of our team’s work. Brand names and logos belong to their owners. Results vary by brand. The guarantee is for brands already making at least $50k a month in email revenue; full terms are agreed on your first call.