Klaviyo Agency Partner & Shopify Email Marketing Experts
Your tech stack matters. The brands getting 30–40% of revenue from email aren't just using good tools—they have a team that knows how to make those tools work together. Klaviyo's deep data, Shopify's commerce engine, and Postscript's SMS automation are a powerful combination. But only if someone actually knows how to wire them up.
Flypost is a certified Klaviyo agency partner that specializes in Shopify email marketing. We build retention programs where Klaviyo, Shopify, and Postscript talk to each other—triggering the right message, to the right customer, at the right time.
Our Platform Certifications
These aren't logos we slapped on a page. We maintain active certifications, stay current on platform updates, and have direct relationships with partner teams. When Klaviyo releases a new feature, we're testing it before most agencies know it exists.
Klaviyo: The Core of Everything We Build
Why Klaviyo for Ecommerce
Klaviyo was built for ecommerce from the ground up. Unlike generic ESPs, it natively integrates with Shopify to pull in real-time purchase data, browsing behavior, cart activity, and customer profiles. That means your automation can be triggered by what customers actually do—not just what list they're on.
For ecommerce brands doing $1M+ in revenue, Klaviyo's predictive analytics, advanced segmentation, and revenue attribution make it the obvious choice. If you're on Mailchimp, Omnisend, or another platform and wondering whether to switch, the answer is almost always yes. Read our Klaviyo vs Mailchimp comparison for the full breakdown.
What We Build in Klaviyo
- Automated flows — abandoned cart, welcome series, browse abandonment, post-purchase, winback, VIP, sunset, and replenishment flows. See our full automation breakdown.
- Advanced segmentation — RFM cohorts, engagement tiers, predicted gender, product affinity segments, and CLTV-based targeting. Every segment updates in real time from Shopify data.
- Campaign strategy & execution — 2–8 campaigns per month with A/B testing, send-time optimization, and dynamic content blocks personalized by segment.
- Custom events & integrations — We build custom Klaviyo events from Shopify webhooks, third-party apps, and product-specific triggers that go beyond Klaviyo's default tracking.
- Klaviyo migrations — Full migration from Mailchimp, Omnisend, or any other ESP. Data mapping, flow rebuilds, list cleanup, and domain warm-up handled end-to-end.
- Deliverability management — Sending domain setup, DMARC/DKIM/SPF authentication, reputation monitoring, and sunset flows for unengaged subscribers. Check your authentication setup with our free tool.
Already on Klaviyo but not sure if it's set up right? Our Klaviyo optimization guide walks through the most common mistakes we see.
Shopify Email Marketing: Making the Integration Work
Klaviyo + Shopify is a powerful combination, but most brands aren't using it to its full potential. The default integration syncs basic order data. We go deeper.
How We Use Shopify Data in Klaviyo
- Product-level triggers — Flows triggered by specific products, collections, or product tags. A customer who buys a bike gets a different post-purchase sequence than someone who buys an accessory.
- Order data for segmentation — We build segments based on total spend, order count, average order value, product categories purchased, and time between orders. This powers everything from VIP flows to winback timing.
- Shopify checkout events — Started checkout, added to cart, and viewed product events feed into browse abandonment and cart recovery flows with dynamic product content.
- Customer tags & metafields — We sync Shopify customer tags and metafields into Klaviyo profile properties for hyper-targeted segmentation. Subscription status, loyalty tier, referral source—whatever data lives in Shopify, we can use in Klaviyo.
- Shopify Plus features — For Shopify Plus brands, we leverage checkout extensibility, custom scripts, and advanced discount logic within Klaviyo flows.
The result: your email and SMS automation is driven by real commerce data, not guesswork. Every message is relevant because it's based on what the customer actually bought, browsed, or abandoned.
Postscript SMS: The Revenue Multiplier
Email is the foundation. SMS is the accelerant. We integrate Postscript SMS with your Klaviyo program so the two channels work as a coordinated system—not two separate teams sending messages at random.
How We Use Postscript
- Cart recovery SMS — Coordinated with Klaviyo cart abandonment emails. If the email doesn't convert, an SMS follows with different messaging. We test timing combinations to find the optimal sequence for your audience.
- Welcome SMS — Instant text with a first-purchase incentive, timed to land right after the email welcome. High open rates, immediate action.
- Shipping & delivery alerts — Transactional texts that keep customers informed and reduce "where's my order" support tickets.
- Campaign SMS — Flash sales, product drops, and VIP-exclusive offers via text for maximum urgency. We manage frequency carefully to keep opt-out rates low.
- Compliance-first approach — Every SMS automation we build is TCPA-compliant with proper opt-in flows, easy unsubscribe, and send-time restrictions. We don't cut corners on compliance.
Commerce7: Email Marketing for Wine Brands
For wineries and wine DTC brands running on Commerce7, we build Klaviyo integrations that sync wine club data, order history, tasting room visits, and club membership status. This powers automations most wine brands don't have—club renewal reminders, allocation announcements, vintage release campaigns, and tasting event follow-ups.
We've built email programs for multiple wineries across Sonoma and Napa, including Corner 103. If your winery is on Commerce7 and needs a Klaviyo partner, see our winery-specific services.
Platform Expertise, Measured in Revenue
These results come from knowing how to make Klaviyo, Shopify, and Postscript work together—not just using them separately. See the full details in our Lofi Girl case study and Linus Bikes case study.
Want to know how much revenue your Klaviyo + Shopify setup should be generating?
Use our free calculator to see the gap between your current email revenue and the benchmark for your store type.
→ Calculate your email revenue potentialMigrating to Klaviyo? We Handle It End-to-End
If you're on Mailchimp, Omnisend, Drip, or another ESP and ready to move to Klaviyo, we manage the entire migration so nothing falls through the cracks:
- Data migration — Subscriber lists, purchase history, engagement data, and custom properties transferred cleanly into Klaviyo.
- Flow rebuilds — We don't just replicate your old flows. We rebuild them using Klaviyo's advanced features—better triggers, smarter splits, dynamic content.
- Domain & IP warm-up — Proper sending domain setup and graduated sending volume to protect your reputation and deliverability.
- List cleanup — We use the migration as an opportunity to clean your list, remove unengaged subscribers, and set up proper segmentation from day one.
- Zero-downtime cutover — We run both platforms in parallel during the transition so no emails get missed and no revenue is lost.
Frequently Asked Questions
What does it mean to be a Klaviyo agency partner?
Klaviyo agency partners are vetted agencies that have demonstrated expertise with the platform. We maintain our certification through ongoing work with Klaviyo clients, stay current on product updates, and have access to priority Klaviyo support and documentation. It means when you work with us, you're getting a team that knows Klaviyo at an advanced level.
Do you only work with Shopify brands?
Shopify and Shopify Plus are where we do our deepest work, but we also support BigCommerce, WooCommerce, and Commerce7. If you're on a different ecommerce platform that integrates with Klaviyo, we can likely work with it. The key requirement is that you're selling products online—we don't work with SaaS or service businesses.
Should I add SMS to my email program?
If you're doing $1M+ in revenue and already have strong email flows in place, SMS is usually the next highest-ROI channel to add. We typically recommend getting core email automation dialed in first, then layering SMS into your highest-performing flows (cart recovery, welcome, VIP). Adding both at once is also fine if the budget supports it.
How long does a Klaviyo migration take?
A typical migration from Mailchimp or Omnisend takes 2–4 weeks including data transfer, flow rebuilds, domain warm-up, and cutover. Complex migrations with large lists or many active flows may take longer. We build a migration timeline upfront so there are no surprises.
Can you help if I already have Klaviyo but it's not performing well?
That's one of our most common engagements. Many brands set up Klaviyo themselves or had a previous agency do basic work that's now underperforming. We audit your account, identify gaps, and either optimize or rebuild. Take the Fit Check to see if your brand is a good match for our services.
What's the difference between Klaviyo and Postscript for SMS?
Klaviyo has built-in SMS capabilities, but Postscript is a dedicated SMS platform with more advanced features for ecommerce—better compliance tools, conversational SMS, and deeper Shopify integration for SMS-specific use cases. We use Postscript for SMS and Klaviyo for email, coordinating both so they work as one system. Some brands use Klaviyo's native SMS, which can work for simpler setups.
Ready to get more from your Klaviyo + Shopify stack?
Book a 30-minute call. We'll review your current setup, identify what's underperforming, and map out the platform optimizations that will drive the most revenue.
→ Book a free discovery call