A good email agency becomes an extension of your team. A poor fit costs months of lost revenue, a damaged sender reputation, and a lot of internal frustration. This guide helps ecommerce brands evaluate agencies on what matters: expertise, process, communication, and results.
The short version: pick an agency that can show how they think, not just what they have done. Look for strategic depth in your platform, a clear process, honest reporting, and a team structure that matches your needs.
First, decide whether you need an agency
| Situation | Agency may help |
|---|---|
| Email revenue has plateaued | Fresh strategy and testing capacity |
| Your team is stretched across channels | Dedicated execution |
| You are migrating platforms | Specialized migration experience |
| Deliverability has dropped | Diagnostic and recovery expertise |
| You want to add SMS, direct mail, or loyalty | Cross-channel planning |
| You have a strong in-house team with capacity | You may not need one. See Agency vs In-House Retention Team |
What to look for
1. Platform depth
For Klaviyo brands, look for certified experts and partner status, and ask for specifics: how they structure flows, segment, and test. Partner tiers signal investment and experience, but they are not a substitute for results in your category.
2. Ecommerce and DTC focus
An agency that works mostly with ecommerce knows the metrics, seasonality, and tech stack: Shopify, loyalty, subscription, reviews, and customer service tools.
3. Strategy, not just sends
A good agency does more than schedule campaigns. They should be able to explain:
- Your biggest revenue opportunities, backed by data
- How they prioritize flows, segments, and tests
- How email fits with SMS, paid, and direct mail
4. Deliverability expertise
Ask how they monitor and protect sender reputation, how they handle list hygiene, and what they do when metrics slip. See Email Deliverability for Ecommerce.
5. Creative and copy quality
Look at samples. Do the emails look like real brands, with clear offers and strong design? Ask who writes and designs, and how brand voice is protected.
6. Testing and measurement
Ask how they design tests, what they measure (revenue per recipient, not just opens), and how they use holdouts to measure true impact.
7. Team structure and communication
- Who is your day-to-day contact?
- Who builds, who writes, who designs, and who reviews?
- How often do you meet, and how do you receive updates?
- What happens if someone leaves the account?
Questions to ask before you sign
- How would you approach our first 90 days?
- What would you want to audit first, and why?
- How do you prioritize between flows, campaigns, and testing?
- How do you measure success, and what reports will we receive?
- How do you handle deliverability issues?
- Who will work on our account, and what else are they responsible for?
- How do you work with our other vendors and channels?
- Can you share examples relevant to our category, with permission?
- How do you handle approvals and turnaround times?
- What would make you recommend that we not work together?
Red flags
- Guaranteed revenue or ROI promises
- Reporting that only shows opens and clicks
- No questions about your business, margins, or customers
- A pitch that is all templates and no strategy
- Vague answers about who does the work
- No process for audits, testing, or documentation
- Pressure to sign quickly
- Reluctance to share references
Green flags
- A sharp, specific audit of your account before or soon after kickoff
- Honest conversation about trade-offs and risks
- Clear ownership, process, and communication cadence
- Willingness to challenge your assumptions respectfully
- A focus on profit and lifetime value, not just revenue
- Experience with channels beyond email
How to run the evaluation
| Step | What to do |
|---|---|
| Shortlist | Choose three or four agencies with relevant ecommerce experience |
| Share context | Give each the same brief: goals, current setup, constraints |
| Review an audit or proposal | Look for specific insights, not generic advice |
| Meet the team | Talk to the people who would work on your account |
| Check references | Speak to current clients in a similar category |
| Start small if possible | A defined first phase reduces risk |
Contract terms to look at
- Scope of work and deliverables
- Term length and how to exit
- Ownership of assets, flows, templates, and account access
- Reporting and meeting cadence
- Data privacy and security expectations
- Staffing commitments
See Retention Marketing Agency Pricing: What to Expect for how agencies structure fees.
Why a retention-focused agency can be a better fit
Email rarely works best alone. A retention-focused agency plans email, SMS, direct mail, loyalty, and subscription together, so you avoid channel silos and over-messaging. See Retention Marketing for DTC Brands.
FAQ
How long should I commit to an agency?
Long enough to see results from strategy and testing, which usually means several months. Look for terms that give both sides flexibility.
Should the agency own my Klaviyo account?
No. You should own your account and assets, and the agency should work inside it.
Do I need a Klaviyo partner specifically?
If you are on Klaviyo, a partner brings platform depth and access to the partner ecosystem, but evaluate results and fit, not just a badge.
What should I give an agency to get started?
Platform access, performance history, brand guidelines, goals, and key contacts.
How soon should I expect results?
Quick wins can appear in weeks, such as fixing broken flows. Larger gains from strategy and testing take longer.
How ATTN helps
ATTN is a Klaviyo Platinum partner agency focused on ecommerce retention across email, SMS, direct mail, and lifecycle strategy. Talk to our team about an audit and what a first 90 days would look like.