A lot of agencies can design a good-looking email. Far fewer know how to build and manage a Klaviyo account that consistently produces revenue. This guide explains the five qualities ecommerce brands should look for before trusting an agency with their email and SMS marketing.
Table of Contents
• Deep Klaviyo Expertise
• A Strategy Built Around Your Customers
• Strong Deliverability and Data Analysis
• Clear Communication and Useful Reporting
• A Focus on Revenue Beyond Email Design
• The Right Agency Should Feel Like a Growth Partner
• Final Thoughts
Deep Klaviyo Expertise
Almost any marketing agency can send a campaign or turn on a basic welcome flow. That does not mean it knows how to manage Klaviyo well.
The best Klaviyo email marketing agency should understand flows, segmentation, campaign planning, A/B testing, analytics, SMS, integrations, deliverability, and the full customer lifecycle. More importantly, the agency should know how those pieces work together.
A welcome flow should do more than send a discount code. It should introduce the brand, answer common objections, feature the right products, and move the subscriber closer to a purchase. The same thinking should carry through abandoned cart, browse abandonment, post-purchase, replenishment, and win-back flows. Each message needs a clear job, but the account should operate as one connected system.
A Strategy Built Around Your Customers
If an agency uses the same strategy for every client, it is probably not much of a strategy.
Customers buy different products for different reasons. A clothing brand may need new product launches, outfit ideas, and messages tied to weather or travel. A skincare brand may need product education, routine guidance, and replenishment reminders. The agency has to understand what customers buy, why they buy it, what stops them from buying, and what may bring them back.
That information should shape the copy, offers, timing, segmentation, and automation. Customers who viewed a product, bought from a specific category, or ignored the last several campaigns should not all receive the same message.
Strong Deliverability and Data Analysis
A great-looking email is worthless if it does not reach the inbox.
Before hiring an agency, ask how it protects deliverability and list health. The team should understand engagement-based sending, suppression, consent, sender reputation, list growth, and the warning signs that an account is starting to have problems.
It should also know how to read the numbers. Opens and clicks can help diagnose performance, but they are not the final goal. Reporting should connect campaigns and flows to conversions, revenue per recipient, repeat purchases, and total revenue.
If a campaign earns plenty of opens but very few sales, sending more campaigns is not automatically the answer. The audience, offer, product, timing, landing page, or call to action may be the real problem. A good agency investigates before making changes.
Clear Communication and Useful Reporting
You should not have to chase your agency to find out what it did with your account.
A reliable agency explains what was completed, what performed well, what underperformed, what it learned, and what it plans to do next. Reports should give you enough context to understand whether the program is improving. A page full of percentages with no explanation is not useful reporting.
Ask potential agencies how often they communicate, what their reports include, who will manage your account, and how quickly they respond when something changes. Clear communication matters because email and SMS touch promotions, inventory, product launches, customer service, and revenue. Your agency needs to stay connected to the rest of the business.
A Focus on Revenue Beyond Email Design
Email design matters, but good design alone does not grow an ecommerce business.
The right agency should think about customer retention, repeat purchase rate, average order value, purchase frequency, and lifetime value. It should ask what happens after a customer buys, when that customer may need the product again, and what the brand can do between purchases to remain useful.
For example, a customer who buys a fitness product may later need setup instructions, training tips, accessories, or a complementary product. Those messages can improve the customer experience while creating additional revenue. The goal is to give customers a relevant reason to return, not to force another promotion into their inbox.
The Right Agency Should Feel Like a Growth Partner
Pay attention to the questions an agency asks during the first conversation. Does the team ask about your current performance, customers, margins, goals, challenges, and purchase cycle? Or does it immediately push the same package it sells to everyone?
A strong agency should be able to find missed opportunities and explain its recommendations in plain language. That may include underperforming flows, weak segmentation, poor account structure, deliverability risks, or Klaviyo features the brand is paying for but barely using.
You are not simply outsourcing a few emails. You are giving another company access to one of your most important revenue channels. The agency should treat that responsibility accordingly.
Final Thoughts
The best Klaviyo email marketing agency will bring more than design skills. Look for deep platform knowledge, a strategy built around your customers, real deliverability expertise, clear communication, and a strong understanding of ecommerce revenue.
At RevGrowth Email Agency, we manage Klaviyo email and SMS with one goal: produce more revenue from the customers and subscribers you already have. On average, our clients generate 36.2 percent of their total revenue through Klaviyo email and SMS.
If you want to know where your account is performing well and where revenue may be getting left behind, request a complimentary retention audit from RevGrowth Email Agency.
