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

Trusted by top companies worldwide

How it works

Choose your devices, send a test, and compare the email your customers will see.

Illustration of an open device selector with Android, iPhone, Windows, Yahoo, Gmail and Outlook icons and checked boxes

Select devices

Choose the email clients and devices your audience uses, including Android, iPhone, iPad and Windows.

An example campaign template beside email platform logos, with a curved arrow pointing to MailSlurp

Send your email

Send a test from your email platform to the MailSlurp render address. We will capture it on your selected devices.

The same example campaign on a phone and tablet beside a thumbs-up, Slack and Microsoft Teams icons

Review and compare

Compare the delivered email side by side, check the layout and images, and share the previews with your team.

Try a free render

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.

Better campaigns means more conversions

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

Monitor identity

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 layouts, missing images and personalization mistakes before your customers do. Email Audit checks the delivered message, and AI checks let you review its content against your own criteria.

Explore Email Audit

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

A CSS document beside a broken image symbol

Find broken CSS and images

Spot unsupported styles and missing images, then compare device previews to see how the layout is affected.

A broken link beside a template expression on paper

Detect broken links and templates

Find failed destinations, unresolved template expressions and placeholder greetings before they reach customers.

A magnifying glass reviewing the text of a document

AI Content Rating

Set your content criteria and use AI to check the delivered message against them, with a result and supporting evidence for each check.

Every email that breaks is a lost customer

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.

A stopwatch with a lightning bolt and a reliability check

Fast renders. Better value.

Start free, then choose a subscription or pay-as-you-go previews. Fast renders or your money back.

Apple Mail

iPadOS Mail

Outlook iOS

Gmail Android

Outlook Android

Outlook Classic

New Outlook

Gmail Web

Outlook Web

View plans

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 delivery as well as design

Your campaign can look right and still land in spam. Inbox placement testing shows where it arrives across Gmail, Outlook, Yahoo and other mailbox providers.

Test before a send or schedule regular checks through your own sending service. Compare inbox and spam results after changes to your sender or campaign.

Explore inbox placement

Preparing a new or recovering sender? Build a steady sending history with email warmup.

Gmail, Outlook and Yahoo beside a message in a spam folder

Preview emails from your sending platform

Follow the test email workflow for your sending platform.

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SendGridPreview API-delivered SendGrid emails.ShopifyPreview Shopify campaigns across devices.WooCommerceCheck delivered order notifications.

Test the email apps your readers use

Follow a guide for Gmail, Outlook, Apple Mail or Yahoo Mail. See how to send a test email and inspect the result on each client, including the available dark modes.

Email Quality

Check how your emails look and where they land.

100 client previews / month
25 inbox placement tests / month
Email audits, monitoring and warmup tools

$79/ month · USD

One person included

View package

Extra previews, warmup senders and activity billed separately.

Start in Sandbox for free

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?

Choose the email clients and devices your audience uses, then send a test email to your MailSlurp render address. You can also import an .eml file. Compare the captured screenshots to check layout, images, spacing and CTA differences 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, 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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