iPhone and Android
Check narrow screens, responsive columns, image scaling and buttons your readers need to tap.
An EmailQA alternative for every screen.
Catch broken layouts across iPhone, Android, Gmail, Outlook and Apple Mail. Preview the email your ESP actually sends, check light and dark mode, and fix problems before customers see them.
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Looks good in your editor. Does it work in their inbox?
Catch broken layouts, missing images and unreadable buttons before customers open your email. MailSlurp renders the delivered message across Gmail, Outlook, Apple Mail, Yahoo and supported mobile and desktop clients.
Check iPhone, Android, desktop and light or dark mode together. Compare the places your audience actually reads email.
Explore device rendering
Gmail, Outlook and Apple Mail
Compare supported mailbox clients, including Outlook Classic and New Outlook, where the same HTML can look different.
Light and dark mode
Spot disappearing logos, low-contrast text and unexpected background colors before you send.
Keep your ESP. Test the email it actually sends.
Build campaigns in HubSpot, Mailchimp, Klaviyo, Brevo or your usual email platform. Send a test to your MailSlurp render address and preview the delivered version, including the images, links and tracking your ESP adds.
Make any correction in the same campaign editor, then send another test. You do not need to move your campaigns or write code.
Find your ESP guide
Send from your email platform
Use a dedicated render address to check the message your provider delivers, not just the editor preview.
Upload HTML or an email file
Start an earlier design check from HTML, or import an exported .eml file when you already have the message.
Repeat the same client checks
Save a target profile and compare matching clients after a change so a correction is easy to verify.
Check the design, the links and the inbox.
A good-looking email still needs working links and a place in the inbox. Pair device previews with Email Audit and a separate inbox placement test through your sending provider.
Review provider-by-provider placement, investigate sender-domain issues and fix content problems before the campaign goes out.
Explore campaign checks
Find broken links and images
Email Audit checks the delivered message for broken links, missing images, unresolved placeholders and other content issues.
Test inbox placement
See inbox, Promotions, spam and not-received results from the provider mailboxes in your placement test.
Check sender health
Follow authentication and domain findings when SPF, DKIM, DMARC or blocklist issues need attention.
Fit previews around your campaign calendar.
Start free, then use prepaid capacity or pay-as-you-go usage for your campaigns and reruns. Review completed previews as they arrive and get Slack or Microsoft Teams notifications when a run is ready or needs attention.
Share the current result with your team. Use the API when previews need to run automatically alongside your existing tests.
See preview options
Prepaid or pay as you go
Choose capacity around the number of campaigns, client targets and corrections your team expects to review.
API access for repeat checks
Create render runs, retrieve results and connect email previews to your application tests or CI workflow.
Keep work moving
Inspect completed targets while the run progresses. Notifications bring the team back when the results need a review.
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.
How email previews work
Keep creating campaigns in your usual editor. Check the delivered email in MailSlurp before you send it to customers.
Send a test email
Create a MailSlurp render address and send a test from your email provider. Choose the clients and display modes your audience uses.
Fix what breaks
Review the screenshots for cropped text, missing images and unreadable buttons. Make corrections in your editor, send another test and compare the affected client again.
Share the checked version
Share the current result with your reviewers. Resolve comments after checking each fix, then get your team's sign-off before scheduling the campaign.
Preview emails from your sending platform
Follow the test email workflow for your sending platform.
BrazeOpen Braze device preview guide
BrevoOpen Brevo device preview guide
Constant ContactOpen Constant Contact device preview guide
GetResponseOpen GetResponse device preview guide
HubSpotOpen HubSpot device preview guide
KitOpen Kit device preview guide
KlaviyoOpen Klaviyo device preview guide
MailchimpOpen Mailchimp device preview guide
MailerLiteOpen MailerLite device preview guide
MailjetOpen Mailjet device preview guide
OmnisendOpen Omnisend device preview guideResendOpen Resend device preview guide
SalesforceOpen Salesforce device preview guide
SendGridOpen SendGrid device preview guideWooCommerceOpen WooCommerce device preview guideTry the switch with one familiar campaign
Use an email your team knows, the clients your audience uses and one correction you can review together.
Choose a complete campaign check
EmailQA's product overview describes rendering, visual feedback and version history. Choose MailSlurp to bring that campaign-review task into a workspace with delivered-email inputs, content audits, inbox placement and sender monitoring. Test the checks you need with your own campaign before choosing a plan.
Match preview spending to your workload
Launch weeks mean more campaigns and more corrections. MailSlurp offers prepaid capacity and pay-as-you-go usage, so include client targets and reruns when comparing preview allowances. Start free to try the workflow with your team.
Bring updates to your reviewers
Connect Slack or Microsoft Teams for render-status notifications. Review comments and compare revisions in MailSlurp, then record the human sign-off where your team already approves campaigns. Developers can add the rendering API when those checks need to run automatically.
Questions before you switch?
What to know when choosing MailSlurp for campaign previews and email proofing.
Why choose MailSlurp as an EmailQA alternative?
MailSlurp previews the email your ESP delivers across supported iPhone, Android, desktop and mailbox clients, including light and dark modes. Add Email Audit, inbox placement and domain monitoring, then use prepaid capacity, pay-as-you-go usage or the rendering API to fit your campaign schedule.
Can I keep using HubSpot, Mailchimp or Klaviyo?
Yes. Keep building the campaign in your current email provider and send a test to a MailSlurp render address. Review the delivered message, make corrections in the original editor and send a fresh test. HTML upload and exported .eml files give you other ways to start. Follow the HubSpot preview guide.
How does my team review and approve an email?
Open the client screenshots, add workspace comments to the run or affected screenshot, then compare the corrected version. Resolve feedback after checking the fix and share the current result for human sign-off. A completed render or resolved comment records progress; your campaign owner makes the launch decision. See a complete campaign review.
Can I share previews and receive Slack or Teams notifications?
Yes. A shared result link lets anyone who has it view that preview. Comments remain with the workspace review. Configure Slack or Microsoft Teams render-status notifications to bring reviewers back to the result when a run finishes or needs attention. Set up render notifications.
Does a successful preview mean the campaign will avoid spam?
Run an inbox placement test as well. A preview shows appearance in the selected client; a placement test sent through your provider shows which test mailboxes received the message in inbox, Promotions or spam. Use those results to investigate the send before launching the campaign. Explore inbox placement testing.
How should I budget for campaign previews?
Start free, then compare MailSlurp's prepaid capacity and pay-as-you-go options against your campaign calendar. Include the clients and display modes you need, reruns after corrections and the team features you will use. Current plans show the available allowances. See current preview plans.
Give your next campaign a proper review.
Start free. Send one test, check the clients your readers use and share the result with your team.