Device Previews guides and tutorials
57 practical MailSlurp resources
Articles and guides
How to Test Email in Outlook Android Dark Mode
Keep email text and buttons readable in Outlook Android dark mode. Use MailSlurp to compare light and dark previews before sending.
Read moretechnicalHow to Test Email in Gmail Android Dark Mode
Catch unreadable text and unexpected color changes in Gmail Android dark mode. Compare the same email in light and dark with MailSlurp.
Read moretechnicalHow to Test Email Campaigns in Gmail.com Dark Mode
See how your email looks inside Gmail's dark browser theme. Compare light and dark previews and catch color problems across web and mobile apps.
Read moretechnicalHow to Preview Email in Outlook on Android
Check your campaign on the Android phones your customers use. Preview Outlook layouts, text and images with MailSlurp before you send.
Read moretechnicalHow to Preview Email in Gmail on iPhone
See how your campaign looks in Gmail on iPhone. Create an account, choose your devices, send or upload an email, then inspect the renders.
Read moretechnicalHow to Preview and Test Email in Outlook on iPhone
Catch cramped text and broken layouts in Outlook on iPhone. Preview your campaign with MailSlurp and compare the other apps your customers use.
Read moretechnicalHow to Preview and Test Email in New Outlook for Windows
Catch email layout and image problems in New Outlook for Windows. Preview the delivered campaign and compare the Outlook apps your customers use.
Read moretechnicalHow to Preview and Test Email Campaigns in Outlook.com
Catch email layout problems in Outlook.com before you send. Preview your campaign with MailSlurp and compare browser, desktop and phone results.
Read moretechnicalHow to Preview and Test Email Campaigns in iPad Mail
Catch email layout problems that a phone preview can miss. Test your campaign in iPad Mail and compare tablet, phone and desktop results.
Read moretechnicalHow to Preview and Test Email Campaigns in Gmail.com
Preview your HTML email in Gmail.com before sending. Use MailSlurp to check the delivered layout, images and footer, then compare browser and mobile results.
Read moretechnicalHow to Preview and Test Email Campaigns in Apple Mail on Mac
Catch desktop email layout problems before sending. Test your HTML email in Apple Mail on Mac and compare it with phone and tablet previews.
Read moretechnicalHow to Preview an Email Campaign in Apple Mail on iPhone
Make sure your email reads well on iPhone. Use MailSlurp to check Apple Mail layouts, images and buttons, then compare other apps and devices.
Read moretechnicalHow to Preview and Test Email in Gmail on Android
Catch broken layouts and hard-to-read text on your customers' Android phones. Preview your campaign in Gmail with MailSlurp before you send.
Read moretechnicalEmail Preheader Text: Make the Inbox Preview Worth Reading
Write useful email preheader text, check what Gmail and Outlook display, and prevent your inbox preview from filling with footer or browser-link text.
Read moretechnicalEmail Accessibility Checklist for Marketing Teams
Check email contrast, reading order, alt text, links and mobile layouts. Use a practical accessibility review alongside real email-client previews.
Read moretechnicalBulletproof Email Buttons: Outlook and Mobile Checks
Keep email buttons readable with images off and usable on phones. Review Outlook fallbacks, dark mode, tracked links and tap areas before sending.
Read moretechnicalYour Email Font Changed: How to Fix Wrapping and Fallbacks
Test what happens when a campaign uses its fallback font. Compare real Gmail, Outlook and Apple Mail results, then repair crowded headings, prices and buttons.
Read moretechnicalYour Email Background Disappeared: Keep the Message Readable
See how one email background changes in Outlook and Gmail, then choose a solid-color fallback or foreground image that preserves the campaign's offer.
Read moretechnicalWhy Your Hidden Email Preheader Appears in the Message
Fix preview text leaking above your campaign. See a real Gmail mobile repair, check your ESP settings, and approve the inbox snippet and opened email separately.
Read moretechnicalSVG or PNG for Email Logos? A Real Gmail and Outlook Comparison
Compare linked SVG, inline SVG and PNG in five real email clients. Choose a reliable campaign logo and test its size, visibility and dark-mode treatment.
Read moretechnicalHow to Preview Email in Apple Mail on Mac, iPhone and iPad
Catch layout and image problems across Apple devices before you send. Use MailSlurp to compare the same email on Mac, iPhone and iPad.
Read moretechnicalHow to Preview and Test HTML Email in Outlook
Preview HTML email in Outlook desktop, web and mobile apps. Compare layouts, images and dark-mode colors with MailSlurp before sending.
Read moretechnicalHow to Preview and Test Email Campaigns in Yahoo Mail
See how your HTML email renders in Yahoo Mail before sending. Use MailSlurp to check campaign layouts and images, then compare other email clients.
Read moretechnicalHow to Preview and Test Email Across Gmail Apps
Catch broken layouts, missing styling and dark-mode problems in Gmail. Compare your email on the web, Android and iPhone with MailSlurp.
Read moretechnicalWhy Mailchimp Emails Go to Spam or Promotions (and What to Fix)
Diagnose why a Mailchimp campaign landed in spam, Outlook Junk, or Gmail Promotions. Check authentication, audience health, content, rendering, and real inbox placement before you resend.
Read moretechnicalWhy HubSpot Marketing Emails Go to Spam (and How to Diagnose It)
Trace a HubSpot marketing email from contact eligibility to Gmail or Outlook placement. Fix authentication, graymail, test-recipient, content, and rendering problems with a repeatable pre-send check.
Read moretechnicalSalesforce Email Deliverability: Settings, Placement, and Previews
Diagnose Salesforce email delivery from org access settings through authentication, subscriber data, inbox placement, and device rendering. Learn which test answers each failure.
Read moretechnicalMailerLite Campaign Not Converting? Check Placement and Mobile Layout
Diagnose a weak MailerLite campaign from subscriber groups and inactivity through spam placement, domain authentication, link scans, and mobile or Outlook rendering.
Read moretechnicalKlaviyo Emails Going to Spam? Diagnose Campaigns and Flows
Find out why Klaviyo campaigns or flows land in spam. Check branded sending domains, engagement segments, Smart Sending, ecommerce content, inbox placement, and device rendering before the next send.
Read moretechnicalBrevo Says Delivered but the Email Is in Spam: What to Check
Understand why a Brevo campaign can be marked delivered while landing in spam. Check domain authentication, sender reputation, Brevo reports, inbox placement, and the final email render.
Read moretechnicalHow to Preview a Mailchimp Test Email Across Devices
Send a Mailchimp test email to MailSlurp, compare Gmail, Outlook and iPhone previews, and check dark-mode contrast and personalized content before launch.
Read moretechnicalSalesforce Marketing Cloud Email Preview Testing Before Launch
Preview Salesforce Marketing Cloud test sends after subscriber data, dynamic content, tracking links, images, and final HTML are applied. Use MailSlurp device previews for Gmail, Outlook, mobile, and dark mode checks.
Read moretechnicalReview and Approve Email Campaigns with Your Team
Build an email preview approval workflow: comment on client screenshots, compare a corrected campaign, resolve feedback and share the final version.
Read moretechnicalHubSpot Email Preview: Send and Check a Test Email
Preview a HubSpot marketing email as a contact, send a test and compare Gmail, Outlook and mobile layouts. Check smart content and dark-mode contrast.
Read moretechnicalHow to Send a Test Email in Klaviyo: Campaigns and Flows
Test Klaviyo campaigns and abandoned-checkout flows with the right data. Follow a real store event into Manual review, then inspect the received email and recovery link.
Read moretechnicalEmailQA alternative for real-device email previews
Preview your ESP campaigns across mobile, desktop and dark mode with MailSlurp. Compare EmailQA alternatives for real-device rendering, APIs and inbox placement.
Read moretechnicalEmail Rendering QA Checklist for Gmail, Outlook, Mobile, and Dark Mode
Use this email rendering QA checklist to preview final emails across clients, devices, dark mode, links, images, and release workflows.
Read moretechnicalCustomer.io Email Preview Testing: Preview Test Sends Before Launch
Preview Customer.io emails after Liquid personalization, event data, tracking links, images, and final HTML are applied. Use MailSlurp device previews for Gmail, Outlook, mobile, and dark mode checks.
Read moretechnicalBest Real-Device Email Rendering Tools for Preview QA
Compare real-device email rendering tools by client coverage, preview workflow, approvals, API automation, and how MailSlurp connects supported device previews with received-message QA.
Read moretechnicalBest Email Preview Tools for Rendering, QA, and Release Checks
Compare email preview tools for Gmail, Outlook, mobile, dark mode, team review, API workflows, and release-ready MailSlurp device previews.
Read moretechnicalWhy Your Email Logo or Button Disappears in Dark Mode
See a real Gmail Android dark-mode logo failure, choose a usable asset, and test logos, text, and campaign buttons before the next send.
Read moretechnicalWhy Emails Break in Outlook: Seven Problems to Check
Identify the Outlook version, diagnose seven common email rendering symptoms, make a practical editor or template change, and verify the repaired campaign.
Read moretechnicalTransactional Email Rendering: Preview Resets, OTPs, and Billing
Preview transactional email rendering before release. Use MailSlurp for password resets, OTPs, invoices, alerts, and onboarding emails.
Read moretechnicalHow to Test Emails on iPhone and Android Before Sending
Send a finished campaign to iOS Mail, Gmail iOS, Gmail Android, and Outlook mobile previews. Catch layout, image, CTA, and dark-mode problems before launch.
Read moretechnicalHow to Preview an HTML Email Before You Send It
Preview an HTML file, saved email or ESP campaign in real mail apps. See an Outlook and Gmail example, fix the layout and check the next version.
Read moretechnicalGmail Email Rendering: Test HTML, Mobile and Dark Mode
Preview delivered HTML emails in Gmail on desktop, Android and iPhone. Check mobile layout, clipping and dark-mode contrast with MailSlurp.
Read moretechnicalESP Email Preview Testing: Render Final Campaign Output
Test ESP email previews after personalization, tracking links, images, and final HTML are applied. Use MailSlurp before campaign launch.
Read moretechnicalEmail Rendering Test for Outlook, Gmail, Mobile, and Dark Mode
Run an email rendering test for Outlook Classic, Outlook New, Gmail, iPhone, Android, and dark mode before a campaign or product email launches.
Read moretechnicalEmail Render Address: Send Campaigns to Device Previews
Use a MailSlurp email render address to start device previews from an ESP, mailbox, or email client before customers receive the message.
Read moretechnicalEmail Preview API: Device Renders for CI and Releases
Use an email preview API workflow to render messages across clients and devices from CI, QA, and release tooling.
Read moretechnical.EML Email Preview: Render Exported Emails Before Approval
Preview an exported .eml email across Gmail, Outlook, mobile, desktop, light mode, and dark mode using MailSlurp.
Read moretechnicalOutlook versions explained: classic Outlook, new Outlook, Outlook.com, Mail, and the rest
A practical guide to the many Outlook apps, including release dates, operating systems, rendering engines, and which version matters for email testing.
Read moretechnicalEmail Preview Tool: Catch Rendering, Dark Mode, and Broken-Link Issues Before Send
Learn what an email preview tool should actually test, how to catch client-specific rendering issues, and why screenshot-only previewing is not enough before launch.
Read moretechnicalRecommended email size limits for reliable delivery
Practical email size guidance for body content and attachments. Learn safe payload budgets, clipping risks, and pre-send checks.
Read moretechnicalLitmus Pricing Comparison for Email Preview and QA Workflows
Find the current Litmus quote route, confirm seats and preview allowances, and compare email preview, inbox testing and automation costs with MailSlurp.
Read moretechnicalGIFs in Email: Test the Frame Your Customers May See
Make animated email GIFs useful when motion stops. Review the first frame, a real-text CTA, loading and client playback before approving a campaign.
Read moretechnicalEmail CSS Support: What to Check Before Approving a Campaign
See tested Gmail, Outlook and Apple Mail examples of email backgrounds, columns, logos, fonts and preheaders, with practical fixes for marketing teams.
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