Email previews across real devices and email clients

Email preview service for real-client rendering before launch

MailSlurp creates real email previews across mailbox clients, devices, and screen contexts so teams can catch broken layouts, missing images, dark-mode issues, preheader problems, and client-specific rendering defects before launch.

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Real device previews

View your emails on real devices and catch issues before clients see them

Review each message across live email clients, compare renders, and inspect the source HTML from one dashboard before a campaign reaches production.

Device preview screenshots shown across connected phones and tablets

View images on real devices

Test email rendering across real mobile, tablet, and desktop devices. Find issues across Gmail, Outlook, Apple Mail and more.

Email previews compared across light mode, dark mode, and desktop clients

Find issues before your customers

From dark-mode and light-mode previews to different Outlook versions, MailSlurp helps you see emails exactly as your clients see them.

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Gmail

Outlook

New Outlook

Classic Outlook

Mail app

iCloud Mail

iPhone

Pixel

Android

Samsung

Windows Mail

macOS

Thunderbird

Proton Mail

Chrome Webmail

Run real-client previews from CI, release checks, or campaign tooling

Trigger renders from a stored email or imported .eml file, wait for screenshots across configured clients, and share the review link with the team.

Start free API reference

MailSlurp device previews

import { Configuration, DevicePreviewsControllerApi } from "@mailslurp/admin-sdk";

const devicePreviews = new DevicePreviewsControllerApi(
  new Configuration({ apiKey: process.env.MAILSLURP_API_KEY! }),
);

const { run } = await devicePreviews.createDevicePreviewRun({
  emailId,
  createDevicePreviewOptions: {
    includeAllConfiguredProviders: true,
    nativeTargets: ["gmail_android_emulator", "outlook_new_windows"],
  },
});

console.log("preview run", run.runId);

Render notifications

Send device render updates to Slack and Microsoft Teams

Keep preview runs visible from start to finish. MailSlurp can notify the channels your team already uses and link reviewers directly to shareable render results.

Slack

Post render started, completed, failed, and partial-result updates into the channels where campaign and QA review already happens.

Channel-level routing
Shareable result links
Test messages before launch

Microsoft Teams

Send device render status into Teams chats or channels so stakeholders can review results without chasing dashboard links.

Team review channels
Result summaries
Admin-aware connection flow

Read notification setup docs