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Four tests. Four wins for Mina Baie.

The premium diaper bag brand drove up to +233% revenue lift per campaign and more than doubled click rates with MailTail.

  • PremiumDiaper Bags
  • Maternity& Parent Essentials
  • DTCLimited Restocks
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Baby & maternity

Peak Revenue Lift

Avg. Open Rate Lift+21%
Avg. Click Rate Lift+138%

Klaviyo A/B test data, March 2026 — head-to-head sends with vs. without MailTail

Restocks and launches stuck in Promotions

Mina Baie's most loyal customers were missing key restock alerts and Founder's Series launches because emails landed in Gmail's Promotions tab. With premium price points and limited inventory, every send that didn't reach Primary was lost revenue.

  • ~54%Baseline open rate
  • ~0.2%Baseline click rate
  • LowRevenue per send

Primary inbox placement on every send

Mina Baie ran a series of 100% test-size A/B tests, sending the same email creative with and without MailTail. The MailTail variant won every test — statistically significant at 100% win probability — across opens, clicks, and revenue.

  • Identical creative, identical lists, identical send time
  • MailTail variant won every metric, every test
  • Statistically significant at 100% win probability
  • Set up with you within 12 hours, no template rewrites

The time slips.

Four head-to-head A/B tests across March 2026. MailTail won every metric on every test.

Harlow Mini Vegan Restock

Flagship test · 169K sends

3.13 Harlow Mini Vegan — "The Mini that Sold Out? She's Back."

Restock alert to non-waitlisters. ~85K sends per variant, statistically significant.

3.13 Harlow Mini Vegan — "The Mini that Sold Out? She's Back.": Control against MailTail
MetricControlMailTailLift
Open Rate53.86%65.36%+21.3%
Click Rate0.22%0.49%+122.7%
Revenue——+232.8%
WINNERMAILTAIL

Founder's Series — Jenna's Bag

Product launch · 173K sends

3.8 Founder's Series — "Jenna's It Bag"

Founder-led product story. ~86K sends per variant, statistically significant.

3.8 Founder's Series — "Jenna's It Bag": Control against MailTail
MetricControlMailTailLift
Open Rate52.07%64.92%+24.7%
Click Rate0.18%0.46%+156.7%
Revenue——+154.9%
WINNERMAILTAIL

Changing Kit Vegan Coco

Restock · 171K sends

3.7 Changing Kit Vegan Coco — "Restock Alert"

Restock alert for the 4-Piece Changing Kit. ~85K sends per variant.

3.7 Changing Kit Vegan Coco — "Restock Alert": Control against MailTail
MetricControlMailTailLift
Open Rate56.79%68.71%+21.0%
Click Rate0.31%0.77%+147.1%
Revenue——+53.0%
WINNERMAILTAIL

Judie Canvas

Product launch

3.11 Judie Canvas Launch

Statistically significant lift across opens and clicks. Revenue lift volatile due to small conversion sample.

3.11 Judie Canvas Launch: Control against MailTail
MetricControlMailTailLift
Open Rate——+19.6%
Click Rate——+125.0%
Revenue——+1,158%
WINNERMAILTAIL

How it was measured.

All data from Klaviyo A/B testing reports, March 2026. Each test compared the same email creative with and without MailTail at 100% test size, with statistical significance reported by Klaviyo at 100% win probability. Revenue figures reflect Klaviyo's placed-order attribution. Results may vary based on industry, list quality, and email practices.

The bottom line.

Across four A/B tests in March 2026, MailTail won every test on every metric.

  • Open Rate Lift Range+19–25%
  • Peak Click Rate Lift+157%
  • Peak Revenue Lift+233%

On the Harlow Mini restock alone, MailTail more than doubled click rate and tripled revenue compared to the same email without MailTail — with 100% statistical significance reported by Klaviyo.

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