Preview delivered emails on real devices and email 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. The free plan includes device renders every month.

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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 the campaign across supported email clients and configured render targets, compare results, and inspect the source HTML before the campaign reaches customers.

Test emails on every client device

Real devices and providers, with fast rendering in light and dark mode.

Gmail, Outlook and Yahoo provider marks on a laptop, tablet and phone

Email clients and devices to compare with MailSlurp
Device	Email app	Appearance
Android	Gmail, Outlook	Light and dark
iPhone	Gmail, Apple Mail, Outlook	Light
iPad	Apple Mail	Light
macOS	Apple Mail	Light
Windows	New Outlook, Outlook Classic	Light
Browser	Gmail	Light and dark
Browser	Outlook.com, Yahoo Mail	Light

Need AOL, older Outlook, Samsung and more? Discuss your requirements.

Email rendering and inspection.

Inspect the email that actually arrived, compare its rendering across clients and devices, and catch delivery or content problems before launch.

Render on real devices

Gmail, Outlook, and Yahoo email clients across phone, tablet, and desktop

Preview one delivered email across Gmail, Outlook, Yahoo, Apple Mail, mobile, desktop, light mode, and dark mode.

View rendering docs

Check inbox placement

Outlook inbox placement result showing an email delivered to spam

Confirm whether the same email reaches inbox, promotions, or spam across Gmail, Outlook, Yahoo, and Apple provider mailboxes.

See placement testing

Verify sender authentication

Sender health score with SPF, DKIM, and DMARC status checks

Track SPF, DKIM, DMARC, MX records, reputation signals, blocklists, and domain changes alongside rendering results.

Explore monitoring

Audit links and content

Email audit score with passed checks, warnings, and errors

Catch broken links, missing images, unsupported markup, and content warnings in the exact email sent for preview.

Explore email audit

Make every click count

Catch broken links, missing images and personalization mistakes before your customers do. Email Audit helps you fix the issues and send with confidence.

Explore Email Audit

A broken link beside an image symbol, illustrating link and image validation

How it works

Move from a delivered test email to cross-device review and team approval in three clear steps.

Send your email to our render inbox

Send from Salesforce, HubSpot, Mailchimp, or your own application to a dedicated MailSlurp render address.

The same delivered email previewed across desktop, tablet, and mobile devices

Log in and view the email across devices

Open the render run and compare the delivered message across desktop, tablet, mobile, and mailbox targets.

A mouse sharing an email render result with a team in Slack

Share a link with your team

Create a shareable result link and send it to Slack so teammates can review the same render evidence.

Preview emails from your sending platform

Follow the exact test-send workflow for your email service provider.

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SalesforceInspect Salesforce emails across clients.

APIs for devs and QA

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

View plans 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);

Check on every client

Device preview screenshots shown across supported clients and device contexts

Test across devices

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

Fix issues fast

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

Apple Mail

iPadOS Mail

Outlook iOS

Gmail Android

Outlook Android

Outlook Classic

New Outlook

Gmail Web

Outlook Web

View plans

Device previews that work your way

Run dependable email previews without changing the tools, providers, or team channels you already use.

Simple pricing

Subscription plans and a pay-as-you-go meter

Choose a bundled subscription or pay as you go.

Fast and reliable

A fast stopwatch with a reliability check

Fast renders or your money back.

Get work done

Get Slack and Microsoft Teams notifications, then share team dashboards.

Speak with sales

Comparing email preview platforms?

See how MailSlurp compares with established email testing platforms, then choose the workflow and pricing that fit your team.

Mailgun

MailSlurp vs Litmus MailSlurp vs Email on Acid MailSlurp vs Mailgun Inspect

Send us your last invoice and we'll beat it.

Email preview and rendering questions

Review the email that actually arrived, compare the clients your customers use, and keep each result available for the next release decision.

How can I preview HTML email in Gmail, Outlook, and Apple Mail?

Send the email to a MailSlurp render inbox or import its .eml source, then start a device preview run with the Gmail, Outlook, Apple, mobile, and desktop targets your audience uses. MailSlurp keeps the screenshots together so layout, images, spacing, and CTA differences are easy to compare before launch. Start with an HTML email preview.

How do I test email in dark mode, iPhone, Android, and desktop?

Choose a target set that includes the mobile, desktop, light-mode, and dark-mode contexts important to the message. Review the same delivered email across those targets, then rerun the preview after changing colors, spacing, images, or responsive markup. See mobile email previews.

Which API automates email rendering tests in CI/CD?

The MailSlurp device preview API can create a render run from a stored email or imported .eml file, poll until the target screenshots are complete, and return result data for a release check. That makes the exact message produced by your application available to CI instead of testing a separate browser mockup. Read the device render API guide.

How can I preview email in Outlook Classic and Outlook New?

Include Outlook Classic, Outlook New, and Outlook.com in the same MailSlurp preview run. Comparing those results side by side helps isolate client-specific behavior in tables, buttons, fonts, spacing, images, and responsive sections before the email reaches customers. See Outlook email previews.

What email accessibility checks can I run alongside device previews?

Pair device previews with Email Audit to check for missing image alt attributes, missing document language, unnamed links and table semantics that need attention. Follow up with manual checks of contrast, zoom, image blocking and screen-reader reading order in the target email apps, including light and dark mode where available. Explore Email Audit checks.

Can I check broken links, images and personalization in the same email?

Yes. Run Email Audit on the delivered message you use for device previews. Review failed link and image URLs, spelling, unresolved template expressions, placeholder greetings, HTML validation and email-client support, then send another test after fixing the findings. See Email Audit.

How do email previews differ from inbox placement testing?

Device previews show how the message appears in selected email clients. Inbox placement testing separately measures whether a test send reaches inbox, Promotions, spam or is not received across seed accounts. Combine them when you want to inspect both the delivered email and its placement. Explore inbox placement testing.

Can I compare a new render with a previous version?

Yes. MailSlurp keeps render history so you can compare a new run with an earlier result and inspect the screenshots side by side. You can also download screenshots through the API and compare them in your own visual regression tests. Read about comparing render runs.

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