Email marketing agency · Seattle, Washington
You're paying to email people who will never buy. We find the ones who will.
MailScale is a Seattle email marketing agency that starts with your audience, not a template. We map who on your list actually buys, which channels feed your engaged segments, and who should stop getting mail. Then we rebuild campaigns, flows, and signup paths around that map.
Nearly all the revenue.
Who we work with
Built for brands where the list is the business
Subscription & membership
Retention is the whole business. We time win-back and cancel-save flows to engagement signals, not fixed calendars.
Cancel-save flow click rate 3.4% to 6.1% for a fitness app we repaired.
DTC ecommerce
Baymard puts average cart abandonment at 70.2%. Recovering even part of it is usually the highest-ROI email work a store can do.
Klaviyo pegs average abandoned-cart flow revenue at $3.65 per recipient.
Consumer apps
App audiences churn silently. Engagement scoring catches the drop before the uninstall, while there is still something to send to.
One 78k-profile app list was pruned 29% under our sunset policy.
B2B SaaS newsletters
Sponsors and sales both read your engagement numbers. A smaller, verified-active list beats an inflated one on every metric that matters.
Gmail and Yahoo enforce spam complaints at 0.3%; we hold clients under 0.1%.
What we do
Four services, one audience map underneath
Every engagement starts with the Audience Intelligence work. The other three services build on what it finds.
Audience Intelligence
Engagement scoring, RFM segmentation, and audience research that shows who buys, who lurks, and who should stop getting mail.
Explore the service →Lifecycle Flows
Welcome, abandoned-cart, cancel-save, and win-back automation. Klaviyo data shows flows drive about 41% of email revenue from 5.3% of sends.
Explore the service →Deliverability Repair
SPF, DKIM, DMARC, one-click unsubscribe, GlockApps seed tests, and Google Postmaster monitoring until your mail lands in the inbox again.
Explore the service →List Growth
Signup forms and popups tested against the 2.1% industry benchmark, fed by channels your actual buyers use.
Explore the service →0%
fewer sends, revenue flat, in a 12-week audience rebuild
0%
Gmail inbox placement after a 7-week deliverability repair
0
subscribers added in 90 days of form and channel testing
$0
average return per $1 spent on email, per Litmus research
Client figures are from representative engagements written up on our proof pages; brands anonymized.
Proof
What the audience map finds
34% fewer sends, flat revenue
A meal-kit brand was mailing everyone. We found the 36% who mattered; complaints fell from 0.31% to 0.07%.
Read the write-up → Deliverability78% to 98% Gmail placement
A membership app's dashboard said 99% delivered. GlockApps said 78% inboxed. Seven weeks later: 98%.
Read the write-up → List growth+4,700 subscribers in 90 days
A book-box brand's popup converted at 1.1%. Two fields, an 8-second delay, and a better offer took it to 3.8%.
Read the write-up →How it works
From audit to audience-driven program
Audience audit
We map engagement, revenue per segment, and deliverability baseline. You see exactly where sends are wasted.
The plan
A 90-day roadmap priced against expected revenue, ordered by what moves numbers first.
Build
Segments, flows, forms, and authentication fixes go live in your ESP account, not ours.
Test & report
Monthly A/B testing and a report in dollars per recipient, never vanity opens.
Questions we hear on most first calls
What does an email marketing agency like MailScale actually do?
We audit who on your list opens, clicks, and buys, then rebuild your program around that map: segmented campaigns, automated flows in Klaviyo or Omnisend, deliverability fixes, and signup forms tested against the 2.1% industry conversion benchmark. You get the strategy, the builds, and monthly reporting in revenue terms.
How is an audience-first approach different from normal email marketing?
Most agencies start with templates and a send calendar. We start by finding the slice of your list that produces revenue. On a recent audit, 64% of one brand's sends went to profiles with no open or click in 120 days. Cutting them improved deliverability, and revenue held flat on 34% fewer sends.
Which email platforms do you work with?
Klaviyo is our main platform, and both of our strategists hold Klaviyo Product certifications. We also run programs on Omnisend, Braze, and Customer.io, and we handle migrations between them. For deliverability we test with GlockApps seed lists and monitor Gmail reputation through Google Postmaster Tools.
How fast should we expect results?
Deliverability repairs show movement in 4 to 7 weeks; one membership app went from 78% to 98% Gmail inbox placement in 7. Audience rebuilds and flow work typically need 8 to 12 weeks to read cleanly, because we A/B test against your real baseline instead of guessing.
Find out where your list is leaking revenue
A 30-minute call. We look at your last 90 days of sends, tell you what we see, and you leave with two or three fixes whether we work together or not.