Skip the
Promotions tab.
MailTail moves your Klaviyo emails into Gmail’s Primary inbox with no change to the design, then proves the lift against an untouched holdout.
Works with GmailBuilt for
G FUEL: +48% campaign revenue and +58% open rate against an untouched holdout.
Roughly 68% of marketing email starts in the slow lane.
That’s how much Gmail routes into the Promotions tab, stacked with forty other sales. A sharper subject line can’t rescue an email nobody sees. Placement decides the open.
Relative open rate by Gmail tab. Placement depends on authentication, sender reputation and engagement, so results vary by sender.
Your templates, one pit wall.
Once you’re set up, every Klaviyo template shows up in one list. Process the ones you want, watch each holdout run, and roll anything back in a click.
- Abandoned cart · Email 2+38%FlowHoldout running
- Welcome series · Email 1+24%FlowProcessed
- Friday drop+41%CampaignProcessed
- Back in stock+19%AutomationProcessed
- Winback · 60 days—FlowOriginal kept
Holdout · Abandoned cart · Email 2
- Template processor
- Browse every Klaviyo template, pick one or fifty, and process them in one pass. Originals are kept.
- Holdout analytics
- Open rate, click rate and revenue per recipient for MailTail against the untouched control, per template.
- Web feed
- Serve the variation through a Klaviyo web feed so it updates without reprocessing templates.
- One-click revert
- Every processed template keeps its original. Roll any of them back from History.
- Multiple accounts
- Run several Klaviyo accounts from one MailTail login on the Business plan.
- Team and audit log
- Invite teammates and see every template change your team made, and when.
Three lights to green.
No snippet to paste into forty templates, no flow to rewire. We do the setup with you.
Every template in the field.
The sends that quietly earn the most are the automated ones. They get the same treatment.
- CampaignsLaunches, promos, one-off sends
- FlowsWelcome, browse, cart, post-purchase
- AutomationsBack-in-stock, winback, replenishment
- Pre-stage
Tell us about your brand
A one-minute form. We reach out within 12 hours to get you set up. No dev ticket, no DNS changes.
- Stage
We inject the variation
MailTail writes a variation unique to your account into each template, underneath the design. Every original is kept.
- Green
Send like you always do
Campaigns and flows go out from Klaviyo as normal, each one racing an untouched holdout on the same list.
Five brands. Five time slips.
Gaming, apparel, maternity, pouches. Every number below is MailTail against an untouched holdout on the brand’s own list, at the same send time.
Nicotine pouches
Revenue
Read the run
Gaming & energy drinks
Campaign revenue
Read the run
Gaming & streetwear
Campaign revenue
Read the run
Baby & maternity
Peak revenue
Read the run
Athletic-leisure apparel
Peak revenue
Read the run
Each study shows the holdout design, the sample, and the lift on every metric tracked. Individual results vary by sender.
All case studiesPasses tech, every send.
MailTail changes how Gmail reads the template and nothing else. Here’s what it is never allowed to touch.
- DNS and authenticationMailTail works at the template level only. SPF, DKIM, DMARC and your sending infrastructure stay exactly as they are.
- Never touched
- Your creativeSame template, same copy, same images. The subscriber sees the email you built.
- Untouched
- RollbackEvery processed template keeps its original. Revert any of them, any time.
- One click
- Change historyEvery template change is recorded in an audit log your team can read.
- Fully logged
- Time to liveConnect in the morning, send optimized templates in the afternoon.
- Same day
Pick your entry class.
No per-send fee, no per-seat pricing. Start free and keep the plan while the holdout keeps paying for it.
Free trial
$0
14 days or 10 templates
- Optimize up to 10 templates
- Full feature access
- Analytics dashboard
- No credit card
Business
Most entered$299
per month
- Unlimited templates
- Multiple Klaviyo accounts
- A/B testing with holdouts
- Up to 5 teammates
- Web feed for dynamic content
Enterprise
Custom
volume-based
- Everything in Business
- Unlimited teammates
- Dedicated account manager
- Custom integrations
- SLA guarantee
Questions from the pit.
Anything else, the help center has the long answers.
Will my subscribers see anything different?
No. MailTail works underneath the design. The template, copy and images your subscriber sees are exactly the ones you built.
Do you touch my DNS, SPF, DKIM or DMARC?
Never. MailTail works at the template level only. Your domain, authentication records and sending infrastructure stay as they are.
How do I know it's working?
Every processed send runs against an untouched holdout: same list, same send time, same creative, split at random. MailTail compares open rate, click rate and revenue per recipient, and waits for at least 100 sends per variant before showing a lift.
Which email platforms do you support?
Klaviyo. We connect your account with you during setup, and campaigns, flows and automations are all covered.
How does setup work?
Fill in the short form and someone from MailTail reaches out within 12 hours. Setup takes a few minutes over email or a quick call: we connect Klaviyo with you, pick your first templates and start the holdout. No developer needed.
Can I undo it?
Yes. Every processed template keeps its original, and you can revert any of them with one click from History.
Line up your next send.
Tell us about your brand. We reach out within 12 hours, set you up, and you read the holdout before you decide anything.
14-day free trial · No credit card · One-click revert on every template