LRN · EMAIL STACK/REV. 2026-06
Sheet— 01 / 10 —EMAIL
001 ·

The owned channel that compounds - flows, deliverability, segmentation, design and testing.

Own the inbox,not just the send.

Here is the RGM email stack - the practitioner guide to email marketing. Automated flows that compound revenue, the deliverability and authentication that get you to the inbox, segmentation, design, and testing. The highest-ROI owned channel, done right. Start with a pillar, explore the periodic table, or filter the index.

0Email guides
0Method families
0Methods, mapped
0Core flows

How to read this stack: email pays when flows compound and mail reaches the inbox. Get deliverability right first, then read your numbers against the 2026 benchmarks. For text, see SMS.

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At a glanceQuick answers

The short answers.

Highest-ROI email?Flows

Triggered flows earn ~20x campaign revenue per send.

Inbox problems?Authenticate

SPF, DKIM and DMARC first.

Open rate real?MPP-inflated

Trust clicks, not opens.

Segment by?Behavior + value

Engagement and lifetime value, not demographics.

Design for?Mobile + dark mode

And accessible, clickable CTAs.

Test what?Subject + offer

The two levers that move revenue.

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Load-bearing guidesSheet — 02 / 10

Six guides hold the roof.

Start here. Email is a stack: deliverability, segmentation, core flows, design, and testing. Learn these six and the rest follows.
Start here
  1. F-01Email overviewWhere email fits in the growth stack.
  2. F-02DeliverabilityThe complete guide to reaching the inbox.
  3. F-03Welcome flowThe first-impression flow that sets engagement.
  4. F-04List segmentationThe right message to the right person.
  5. F-05Design systemsOn-brand, reusable email components.
  6. F-06A/B testingTest subject, offer and design properly.
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The email indexSheet — 03 / 10

Every method, filed.

Look at the email library by family. Filter by name or pick a family. The marquee guides are below, and search opens the rest.

Showing 26 of 26 methods

No method matches that filter. Search the full library — it reads every page.

This is the curated index. The full email stack holds 178 pages — search the complete collection or jump to any family above.

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The map of emailSheet — 04 / 10

The periodic table of email.

Hover or tap a method. Thirty email methods grouped into six families - flows & automation, deliverability, segmentation, design & dev, testing & copy, and campaigns. Filter by family, or hit ★ Core for the ten that anchor most programs. Each tile links to its guide.
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Email by the numbers — 2026Sheet — 05 / 10

The numbers that pay.

Tap a card. Email is the highest-ROI owned channel - but only if it reaches the inbox and the flows compound. Here are the 2026 numbers, each sourced and linked to the method and the compendium.
~20xFlows beat campaigns

Flow vs campaign RPR

KlaviyoWelcome flow →
Did you know? ↗
35.6%The open-rate mirage

Avg open rate (MPP-inflated)

MailchimpA/B testing →
Did you know? ↗
83.5%One in six never lands

Global inbox placement

ValidityDeliverability →
Did you know? ↗
0.30%Stay under the cap

Spam-complaint cap

Google/Yahoo; MailgunSegmentation →
Did you know? ↗
70.2%Recover the cart

Carts abandoned

Baymard InstituteAbandoned cart →
Did you know? ↗
2.62%Click, not open

Avg email click rate

MailchimpCTA design →
Did you know? ↗
Everyone obsesses over the send. The money is in the flow, the segment, and the inbox you actually reach.
— RGM analysis, 2026

Email benchmarks, 2026 — see the full sourced set in the RGM Benchmarks compendium.

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RGM email toolsSheet — 06 / 10

Model the revenue.

Use these. RGM ships free calculators for the email decisions that matter - deliverability risk, flow ROI, holdout lift, list health - no signup.
RGM ToolDeliverability Scorecard

Score your inbox-placement risk.

 RGM ToolWelcome Series ROI

Model the payback of a welcome flow.

 RGM ToolEmail Holdout Lift

Prove email's incremental revenue.

 RGM ToolLifecycle Revenue Model

Project flow revenue over time.

 RGM ToolList Health Planner

Plan sunsetting to protect reputation.

 RGM ToolAOV Calculator

Order value by segment.

 RGM ToolLTV Calculator

Lifetime value of a subscriber.

 RGM ToolChurn Rate

Quantify list and revenue churn.

 RGM ToolCustomer Lifetime

How long subscribers stay.

 RGM ToolROAS Calculator

Return on email spend.

 RGM ToolCAC Calculator

Cost to acquire a subscriber.

 RGM ToolMER Calculator

Blended efficiency with email.

Browse every calculator on the RGM tools floor, or start with the benchmarks compendium.

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MethodSheet — 07 / 10

How to build an email program.

Five steps. A well-built email program compounds for years. Here is the sequence from inbox to test.
  1. Authenticate and warm up. Set up SPF, DKIM and DMARC and warm your sending so you actually reach the inbox.
  2. Segment by behavior and value. Group subscribers by engagement and lifetime value so the right message reaches the right person.
  3. Build the core flows. Ship welcome, abandoned-cart, post-purchase and win-back - they earn most of the revenue.
  4. Design mobile-first. Design for mobile and dark mode, with clear CTAs and accessible markup.
  5. Test subject and offer. A/B test subject lines and offers, and judge on clicks and revenue, not inflated opens.
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Go deeperSheet — 08 / 10

The deep guides.

Beyond the basics. Each method has a full deep dive - from abandoned-cart flows to DMARC authentication and Klaviyo flow design. The full stack holds 178 pages, including industry playbooks.
Deep guideDeliverability Guide

Reach the inbox, reliably.

 Deep guideAbandoned Cart Flow

The top revenue flow.

 Deep guideDMARC Authentication

Protect your domain.

 Deep guideDesign Systems

On-brand, reusable email.

 Deep guideIP Warmup

Ramp without burning reputation.

 Deep guideKlaviyo Flow Design

High-converting flows.

Working a vertical? The stack has email playbooks for DTC, B2B, automotive and more. Search the playbook library →

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The voices — top 12Sheet — 09 / 10

The voices — top 12.

Follow these. The people who shaped email and lifecycle marketing - from permission marketing to modern deliverability research. Each links to a profile.
01Chad WhiteLitmus; email research & deliverability 02Seth GodinPermission marketing - the email doctrine 03Byron SharpReach & light buyers 04April DunfordPositioning that sharpens the message 05Neil PatelEmail & content at scale 06Gary VaynerchukAttention & owned audiences 07Rand FishkinOwned channels over rented reach 08Sean EllisLifecycle & retention 09Lenny RachitskyLifecycle & growth 10Peep LajaTesting & conversion copy 11Brian BalfourRetention loops 12Mark RitsonMessage & effectiveness

Browse all marketing thought leaders →

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FAQSheet — 10 / 10

Email questions.

What is the highest-ROI email tactic?

Automated flows. Triggered welcome, abandoned-cart and post-purchase flows earn far more revenue per recipient than one-off campaigns - often around 20 times more.

Why are my emails going to spam?

Usually authentication or reputation. Set up SPF, DKIM and DMARC, keep complaints below 0.3%, warm new IPs, and prune unengaged subscribers. Deliverability is a reputation game.

Is open rate still a reliable metric?

Not on its own. Apple Mail Privacy Protection inflates opens with machine loads. Judge engagement on click rate and click-to-open rate, and use opens only as a rough directional signal.

How should I segment my email list?

By behavior and value first - engagement recency, purchase history and lifetime-value tiers - not demographics. A few segments you treat differently beat dozens that all get the same email.

What email flows should I build first?

Welcome, abandoned-cart, post-purchase and win-back. These four capture the highest-intent moments and drive the majority of automated email revenue.

What is DMARC?

DMARC is an email-authentication policy that builds on SPF and DKIM to protect your domain from spoofing. It is required for bulk senders to Gmail and Yahoo.

Sources & provenance

  1. Email benchmarks (flow vs campaign revenue, open and click rate, inbox placement, spam-complaint cap, cart abandonment) are drawn from the RGM 2026 Benchmarks compendium, which sources each figure to Klaviyo, Mailchimp, Validity, Google/Yahoo (Mailgun) and Baymard.
  2. Email family groupings and the periodic-table layout are RGM's synthesis; every tile links to its full guide.
  3. Stack census — RGM analysis, June 2026; email guide counts are live totals from the deployed tree.