Preview delivered emails on real device and mailbox clients before launch

MailSlurp creates previews for Gmail, Yahoo, Outlook.com, Outlook Classic, Outlook New, iPhone, Android, and other targets so teams can catch broken layouts, missing images, and client-specific rendering defects before launch. Start with a 7-day free trial.

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Email previews across supported clients and device contexts

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Client and device previews

Preview delivered emails before customers see them

Review each message across supported email clients and configured render targets, compare results, and inspect the source HTML from one dashboard before a campaign reaches production.

Device preview screenshots shown across supported clients and device contexts

Preview screenshots in supported clients

Test email rendering across supported mobile, desktop, webmail, and native-app contexts. Find layout, image, spacing, and CTA visibility issues before launch.

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

Find issues before your customers

Use configured target sets to compare important client contexts, catch contrast and spacing regressions, and review the same email your app or ESP produced.

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Apple Mail

iPadOS Mail

Outlook iOS

Gmail Android

Outlook Android

Outlook Classic

New Outlook

Gmail Web

Outlook Web

Run previews from CI, campaign QA, or the API

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 trial API reference

MailSlurp device previews

import { Configuration, DevicePreviewsControllerApi } from "mailslurp-client";

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