What email width works best for Outlook compatibility?
A 600px container is the safest baseline for broad Outlook compatibility.
Short answer
A 600px container is the safest baseline for broad Outlook compatibility.
What this means
Sticking to conservative layout width and clear section spacing reduces rendering regressions across desktop Outlook variants.
Why this matters
The reader needs to turn this newsletter guidance into a usable campaign decision, not only understand the definition. The practical job is to clarify audience, message hierarchy, CTA, production constraints, and the review standard before creating or updating the template.
How to decide
- The answer maps to the real newsletter campaign goal and audience.
- The recommendation keeps one primary action clear.
- The resulting template can be reviewed on mobile before sending.
- Sticking to conservative layout width and clear section spacing reduces rendering regressions across desktop Outlook variants.
Before you build
- Use this guidance when working on transactional templates.
- Define the audience, campaign trigger, message job, and one primary CTA.
- Apply the recommendation: A 600px container is the safest baseline for broad Outlook compatibility.
- Review the draft against common mistakes before moving into ESP QA.
- Turn the final decision into a brief with audience, offer, tone, CTA, and ESP handoff notes.
What good looks like
- The reader can explain the decision and apply it to a real campaign.
- The template has one clear message path and one primary next action.
- The output can move into generation, editing, or ESP QA without a new strategy pass.
- The final draft avoids the common mistake: Using wide multi-column structures that collapse poorly.
Example brief
Newsletter working brief
A marketer needs to turn the answer into a production-ready email direction before generating or editing a template.
Inputs
- Question to resolve: What email width works best for Outlook compatibility?
- Campaign context: audience, offer, timing, tone, CTA, and sending platform.
- Starting recommendation: A 600px container is the safest baseline for broad Outlook compatibility.
Expected output
- A clear template direction with section order and CTA hierarchy.
- A reusable prompt or brief that can generate the first draft.
- A QA checklist for mobile readability, copy clarity, and platform handoff.
Best fit
- Transactional templates
- B2B newsletters
- Cross-client production sends
Common mistakes
- Using wide multi-column structures that collapse poorly
- Relying on advanced CSS not supported in email clients
- Skipping client-specific QA before launch
Use this as a brief
Generate an email layout optimized for Outlook with a 600px container, clear hierarchy, and robust fallback-safe spacing.
Related questions
How should this answer be used in a real email workflow?
Turn the recommendation into a short brief, generate or edit the template, then QA the mobile reading order, CTA clarity, and ESP handoff before sending.
When should the recommendation be changed?
Change it when audience intent, campaign goal, platform constraints, or performance evidence point to a different structure or CTA priority.
Tools that help
Generate the template
Turn this guidance into a responsive HTML email template with campaign structure, editable copy, and ESP-ready output.