Ten questions separate agencies that grow email revenue from agencies that send email: ask about flow strategy, attribution, deliverability ownership, reporting metrics, pricing structure, contract terms, team, platforms, past failures, and first-90-day plans. The answers matter more than the portfolio, because portfolios show wins and questions expose process. Here is each one, and what a good answer sounds like.
1. "What share of our email revenue should come from flows, and how do you get there?" Klaviyo's 2026 benchmarks show flows driving about 41% of email revenue from 5.3% of sends. An agency fluent in that number is fluent in the work; an agency that answers with campaign ideas is selling sends.
2. "Who personally owns deliverability, and what did they fix last month?" You want a name and a recent, specific fix — an authentication repair, a sunset policy, a placement recovery. Deliverability without an owner is a revenue dip waiting for a discovery date.
3. "Which metric do you report first?" Revenue per recipient and flow-attributed revenue are working answers. Open rates are not — privacy proxies inflated opens beyond usefulness years ago, and agencies still leading with them are choosing the easiest metric to look good on.
4. "What is in the monthly retainer, itemized?" Compare the list against the full service stack an agency should deliver. Segmentation depth and structured testing are the two items most commonly missing in quiet ways you only notice at month four.
5. "How is pricing structured, and what triggers overages?" Anchor against market ranges — $2,000–$10,000+ monthly for DTC scopes, with the full model breakdown in what agencies cost. Surprise overage triggers (extra campaigns, extra segments) belong in writing before signature.
6. "What are the contract terms if this is not working by day 90?" Email programs need a quarter to prove out, so an initial commitment is fair. But a twelve-month lock with no performance checkpoint transfers every ounce of risk to you. Month-to-month after a 90-day proving period is the honest structure, and agencies confident in their work agree to it readily.
7. "Who exactly works our account, and for how many hours?" The pitch team and the delivery team are often different people. Ask for names, roles, and weekly hours — then ask who else those people serve. A strategist across forty accounts is a template with a calendar.
8. "What platforms do you hold real partner status on?" Match their bench to your stack — our comparison of the best ecommerce email agencies lists platform depth for the major players. Partner tiers are imperfect signals, but an agency learning your ESP on your retainer is worse.
9. "Tell me about a client where your playbook failed." Every honest agency has one, and the good ones can name what they changed because of it. The dodge — "we succeed with everyone" — is itself the red flag.
10. "What happens in the first 30 days?"The right answer is unglamorous: audit, authentication fixes, core flow rebuilds. Configuration before headlines. Anyone promising transformation in two weeks is describing luck.
Ask for the reference they did not offer. Every agency supplies happy references; the informative call is with a client who left. Ask directly: "Can I speak with a brand that ended its engagement in the last year?" A confident shop produces one and lets the conversation happen; the refusal tells you how departures go. On that call, ask two things — what the agency was like in month six versus month one, and how the handover went: whether flows, templates, and segment definitions left cleanly or had to be pried loose. Offboarding behavior is the most honest reference an agency has, because nobody polishes it for sales.
Then run the bake-off. Give your two finalists the same short brief and compare the specificity of what comes back — real numbers beat adjectives every time. Score everything on a sheet instead of vibes: our agency evaluation scorecard turns these ten into a weighted checklist you can reuse across every pitch. And if you want our own answers to all ten on record, ask — we would rather lose in the first call than in month six.
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