Skip to main content
Every email Migma produces — whether you typed it, imported it from Figma, an image, raw HTML, or a Claude design — compiles to table-based, email-safe HTML through one engine, built for 100% inbox compatibility. It renders reliably across Gmail, Outlook, Apple Mail, Yahoo, and mobile. Email clients are not browsers—CSS support is limited and Outlook desktop uses Microsoft Word’s rendering engine—so Migma optimizes for real-world inbox rendering and verifies it with Email Preflight, rather than promising pixel-identical parity in every client.

​
Client families we design for

Gmail (web), Outlook.com, Yahoo Mail, AOL, iCloud Mail, and similar web clients.
Preflight shows client preview images with pass, warning, or fail status for many of these environments. See Email Preflight. Email Preflight grid showing the email rendered across multiple clients with pass, warning, and fail tags

​
Legacy Outlook

Outlook desktop (2007 through current supported releases) has unique constraints: limited CSS, no standard margin on many elements, and conditional comments for some layout patterns. Migma approach:
  • Layout structures that work with Word-based rendering
  • Inline and email-safe styling patterns where needed
  • Preflight CSS compatibility reports flag client-specific issues
We document Outlook 2003+ in preflight client coverage. Do not assume identical rendering on every Outlook version without running Preflight on your specific design.

​
Dark mode and light mode

Many clients invert or recolor emails in dark mode. Poor dark-mode support leads to unreadable text, invisible buttons, and broken brand appearance. Migma controls for this directly: it emits explicit color-scheme and supported-color-schemes metadata, and can lock your brand colors so they aren’t inverted — so the email renders consistently and predictably in both light and dark mode instead of being left to each client to guess. The same email rendered in light mode and dark mode, both readable and on-brand Migma optimizes for:
  • Predictable rendering in light and dark presentations via explicit color-scheme metadata
  • The option to lock brand colors so logos and CTAs aren’t inverted or washed out
  • Readable text and background contrast when a client does recolor
  • Logo and image choices that hold up when clients alter colors
For research on dark mode and deliverability, see the Dark mode case study.

​
Why emails look different across clients

Many properties (flexbox, grid, advanced selectors) are unsupported or partially supported. Migma favors patterns known to work in email HTML.
Some clients block images by default. Important content should not rely on images alone; use alt text and readable HTML text.
Clients may force dark backgrounds or invert colors. Design and test for both presentations.
Custom fonts work in some clients and fall back to system fonts in others. Migma applies web-safe fallbacks where needed.

​
How to verify before you send

1

Generate or edit your email

Use the visual editor or design chat until the layout matches your brand.
2

Run Email Preflight

Review client previews, CSS compatibility, links, and deliverability score.
3

Fix issues

Edit manually or use Fix with AI for flagged problems, then re-run Preflight.
4

Send a test

Send to your own inboxes (Gmail, Outlook, Apple Mail) for a final sanity check.

Email Preflight

Automated client previews and compatibility checks.

Deliverability best practices

Inbox placement and content quality guidance.

Export options

Export tested HTML to your ESP.

Outlook without domain setup

Use exported HTML inside Outlook when domain approval is blocked.