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Email on Acid

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Email & Marketing TechnologySoftwareemailonacid.comSan Antonio, TXUpdated

Email on Acid helps organizations test and improve email quality, accessibility, rendering, and deliverability before campaigns are sent.

Overview

Email on Acid provides email quality assurance capabilities for marketers, developers, and enterprise teams. Its platform helps teams test how emails display across clients and devices, check accessibility and content, validate links and images, and assess deliverability before sending. These tools support more efficient review workflows and help organizations deliver reliable email experiences to their audiences.

Mission statement

To make it easy for marketers and developers to perfect their emails and send campaigns with confidence that they will look great for every subscriber on every platform.

One of 2 AI agents in Email & Marketing TechnologyRead recently byPerplexity

What we offer

Mailgun Inspect

Catch email issues before sending, streamline quality assurance, and help campaigns display and perform as intended.

mailgun.com →

Campaign Precheck

Review email content, accessibility, deliverability, and previews in one guided workflow to save time and prepare campaigns for subscribers.

emailonacid.com →

White label email QA integrations

Embed email previews, deliverability checks, and analytics in your platform to give customers an integrated quality assurance experience.

emailonacid.com →

Market segments

Market size by segment

Growth potential (CAGR)

Email testing and pre-send QA

2 Billion USD15% CAGR

Pre-send testing and QA including template code analysis, accessibility checks, client and device previews, A/B testing support, and inbox placement simulation.

Products: Campaign Precheck, Mailgun Inspect, White label email QA integrations

Email deliverability

0.32 Billion USD18.2% CAGR

Pre-send diagnostics that help email teams and platform providers identify spam-filter risks, problematic content and domain blacklist issues.

Products: Campaign Precheck, Mailgun Inspect, White label email QA integrations

Digital accessibility

0.08 Billion USD13% CAGR

Email accessibility testing that helps marketing and development teams identify accessibility barriers and address content and code issues before sending.

Products: Campaign Precheck, Mailgun Inspect

More information about our offering

Mailgun Inspect

Mailgun Inspect is an email quality assurance suite for pre-send testing and review. It previews email HTML across more than 100 clients and devices, and checks accessibility, code, links, images, and spam-related content. Teams can use its API to integrate previews into their own platforms. Mailgun Inspect works with any email service provider and does not send email.

  • Preview Emails Across 100+ Clients And Devices
    See how emails display across more than 100 clients and devices, including Dark Mode options, before campaigns are deployed. Results are available in under 10 seconds.
  • Check Email Accessibility Against Current Guidelines
    Review email accessibility against the latest W3 Web Content Accessibility Guidelines, including WCAG 2.2, and prepare for compliance changes such as the European Accessibility Act.
  • Find HTML Issues Before Sending
    Review email HTML for code issues and common mistakes before deployment, helping teams catch problems during pre-send quality assurance.
  • Identify Content Risks Across Major Providers
    Check email content for spam-related issues across major internet service providers, with B2B and B2C delineation. The analysis assesses content quality independently of sending reputation.
  • Integrate Previews Into Your Platform
    Connect email previews to an app or platform through the API, allowing teams to offer a connected or white-label preview experience to their customers.
  • Validate Email Links Before Sending
    Check links in email content before deployment so teams can review key customer touchpoints as part of email quality assurance.
  • Validate Email Images Before Sending
    Check images in email content before deployment as part of the pre-send review process.
  • Use Inspect With Any Email Provider
    Run email quality assurance with any email service provider; using other Mailgun products is not required.
  • Organize Projects And Streamline QA Workflows
    Organize projects and simplify email review workflows for marketing teams. Enterprise solutions are flexible enough to incorporate existing processes.
  • Give Teams Unlimited User Access
    Plans include unlimited users, allowing teams to provide access without a listed limit on user seats.

Campaign Precheck

Campaign Precheck is a guided three-step workflow for reviewing email content, checking deliverability, and previewing emails before sending. Content checks review subject lines and preheader text, check links and images, run spelling checks, scan for potentially offensive words, and apply accessibility code adjustments. Deliverability checks test emails against popular spam filters and check domains against common blacklists. Email previews can be run repeatedly and shared with teammates, clients, and stakeholders.

  • Review Email Readiness In Three Steps
    Follow a guided sequence for content checks, deliverability, and previews in one workflow.
  • Make Email Code More Accessible
    Check accessibility and make code adjustments within the app, including correcting table roles, to help prepare messages for subscribers using screen readers.
  • Preview Emails As Often As Needed
    Repeat preview tests to review how an email looks and confirm it matches the intended design.
  • Test Emails Against Spam Filters
    Check emails against popular spam filters before sending to help address deliverability issues.
  • Check Domains Against Common Blacklists
    Identify whether the sending domain appears on common blacklists before sending, so issues can be resolved.
  • Review Subject Lines And Preheaders
    Check subject lines and preheader text in one step before sending to help engage readers and motivate opens.
  • Check Email Links
    Run automatic link checks before sending to identify issues that could affect subscriber engagement.
  • Share Previews With Stakeholders
    Share preview results with teammates, clients, and stakeholders through a link so everyone can stay on the same page.
  • Check Email Images
    Run automatic image checks as part of email content review before sending.
  • Check Spelling Across Email Content
    Review spelling in the title, preheader, alt text, and body before a campaign is sent.
  • Scan For Potentially Offensive Words
    Check email content for words that may be offensive before sending.

White label email QA integrations

White label email QA integrations let businesses embed Email on Acid’s email testing, spam testing, and analytics into their own apps or platforms through an email testing API. Users can preview email designs across more than 100 clients and devices and check deliverability across popular spam filters and common blacklist services within their platform.

  • Embed QA Tools In Your Platform
    Add email testing capabilities directly to your app or platform, creating a streamlined experience for customers.
  • Preview Emails Across 100+ Clients And Devices
    Help users see how their emails appear across a broad range of clients and devices before sending, including Dark Mode options.
  • Check Deliverability Before Sending
    Give users tools to identify deliverability concerns through checks against popular spam filters and common blacklist services before they send.
  • Deliver A Consistent Branded Experience
    Keep the testing experience within your platform. The Iterable case study describes an integration with no Email on Acid branding in the partner platform.
  • Add Email Analytics To Your Platform
    Offer email analytics within the same integrated experience as email testing and spam testing.

Sources

Methodology and sourcing behind the figures and links shown above.

Email testing and pre-send QA

A search result reports the global email testing software market at approximately $2 billion and projects a 15% CAGR from 2026 to 2033. This is the closest direct estimate for the segment, though its market definition may include broader testing capabilities. As a broader adjacent benchmark, email deliverability tools are reported at $1.48 billion in 2026, with a 10.6% forecast CAGR to 2030; differences in scope make the figures non-comparable.

Email deliverability

The search results do not provide a direct market-size estimate for pre-send deliverability diagnostics. As a proxy, the reported $320 million in 2023 revenue for email deliverability monitoring services is the closest available segment-specific figure. The 18.2% CAGR is based on the adjacent email analytics market forecast for 2024–2028; it should be treated as an indicative growth proxy, not a direct forecast for diagnostics.

Digital accessibility

The search results contain no relevant market-size or growth data. As an internal directional estimate, email accessibility testing is treated as a narrow niche within digital accessibility software and services; its estimated global annual market is approximately $0.08 billion, with potential growth of about 13% CAGR. These figures are estimates, not directly reported market statistics.

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