Send a test from your existing ESP
Use a dedicated render address to inspect the final message after merge tags, tracking links, hosted images, and ESP processing are applied.
The Email on Acid alternative for faster campaign QA
Keep your existing ESP, catch broken content across supported email clients, and give reviewers one clear result to approve. Start free or ask for predictable pricing based on the way your team tests email.
Trusted by email, CRM, QA, and development teams worldwide
Keep your ESP and move email QA to MailSlurp
Send the final message from Salesforce Marketing Cloud, Mailchimp, HubSpot, or your own application. MailSlurp can receive the email through a render address, open a message already in an inbox, import an .eml file, or start from HTML before comparing supported clients and devices.
Bring the artifact you already have
Paste HTML while a template is being built or import the exported .eml file when the exact campaign output needs approval.
Review the clients your audience uses
Select supported Gmail, Outlook, Apple Mail, mobile, desktop, light mode, and dark mode targets for each review profile.
Catch expensive email mistakes before customers do
Review the final delivered message for visual, content, accessibility, and delivery problems before your team approves an important send.
Look right in every important inbox
Catch layout and responsive problems across supported Outlook, Gmail, Apple, mobile, desktop, light mode, and dark mode targets.
Find broken images, links, and CTAs
Inspect the delivered message before a missing asset, broken destination, or content warning reaches customers.
Catch dark mode and accessibility problems
Review contrast, hidden content, unsupported markup, and readability across the contexts your customers use.
See inbox and spam outcomes
Pair visual approval with inbox placement and sender-health evidence before an important campaign reaches your audience.
Fix and approve campaigns faster
Keep every reviewer on the same client set and the same result, then rerun the changed version without rebuilding the review from scratch.
Save the clients that matter
Reuse the same set of high-priority mailbox clients and devices instead of rebuilding the render matrix for every send.
Compare revisions quickly
Review the changed result across important clients and focus on layout, images, CTA visibility, responsive behavior, and dark mode.
Share one result for approval
Share one result with marketers, developers, QA, agencies, and stakeholders so everyone reviews the same evidence.
Keep reviewers moving
Notify reviewers in Slack or Teams when results are ready so feedback and approval do not wait in another inbox.
Move to MailSlurp on terms that fit your team
Keep the review process your team relies on while choosing preview volume, access, automation, support, and pricing that match your email program.
Predictable custom packages
Talk to MailSlurp about a package shaped around your preview volume, inbox testing, automation, team size, and support needs.
Preview volume that matches your team
Choose the client coverage, rerun volume, team access, and support your email program actually needs.
Enterprise controls
Use team permissions, account controls, and enterprise security options for production campaign and product-email workflows.
One package for broader email QA
Include previews, inbox testing, placement, sender monitoring, automation, and support in a package shaped around your needs.
Automate repeatable email QA when your team is ready
Marketing teams can keep using the dashboard and their existing ESP workflow. Add API-triggered previews, delivered-message checks, or CI protection only where automation saves time.
Use render addresses and .eml files
Bring the final ESP output into MailSlurp without changing the tools your marketing team uses to build and send email.
Trigger previews through the API
Start repeatable preview runs from campaign tooling, release checks, or your own application when needed.
Protect critical email in CI
Verify delivered content and connect Playwright, Cypress, Selenium, Postman, or an existing test suite to release-critical email.
Frequently asked questions
See how MailSlurp supports your email clients, existing ESP, migration process, and pricing requirements.
Is MailSlurp an alternative to Email on Acid?
Yes. MailSlurp supports real-client previews, content and link checks, inbox placement, sender monitoring, and repeatable campaign review. Teams can also add programmable inboxes, delivered-message checks, and API automation for product and transactional email when needed. Discuss migration pricing
Does MailSlurp support the same email clients as Email on Acid?
MailSlurp supports major targets including Gmail, Yahoo, Outlook.com, Outlook Classic, Outlook New, iPhone, Android, desktop, mobile, light mode, and dark mode contexts. Because provider catalogs change, compare MailSlurp's current supported-client list with the clients your team tests today. See device preview coverage
Can I migrate my Email on Acid workflow to MailSlurp?
Yes. Send the final ESP message to a MailSlurp render address, open a message received in a MailSlurp inbox, paste HTML, or import an .eml file. You can then save repeatable client profiles, share results, and automate checks through the API. Read the render workflow
Can I keep Salesforce Marketing Cloud or my existing ESP?
Yes. MailSlurp can sit beside Salesforce Marketing Cloud, HubSpot, Mailchimp, and other sending platforms. Send the processed test email from the ESP to MailSlurp so reviewers inspect the message after merge tags, tracking links, hosted images, and campaign processing are applied. See Salesforce Marketing Cloud testing guidance
Is MailSlurp pricing flexible for an Email on Acid migration?
Yes. Start free, then bring your Email on Acid invoice or Mailgun Inspect quote. MailSlurp can build a package around preview volume, inbox testing, automation, team access, support, and the other email QA work your organization needs. Request a tailored package
Test MailSlurp with one of your own emails
Send a campaign or transactional message, preview it across supported clients, and check its content, links, inbox placement, and delivered result.