Unleash flawless email campaigns with automated QA, rendering previews, and deliverability testing.
Email on Acid, now a core component of the Sinch email portfolio, is a sophisticated pre-deployment platform designed for technical email developers and high-volume marketers. By 2026, the platform has evolved its 'Campaign Precheck' architecture into an intelligent, automated workflow that addresses the increasing complexity of disparate mail client rendering. The platform utilizes a proprietary cloud of real hardware and virtualized environments to provide pixel-perfect screenshots across 100+ email clients, including legacy Outlook versions and the latest mobile OS iterations. Its technical value proposition lies in its holistic approach to email health, encompassing WCAG 2.1 accessibility standards, URL validation, image optimization, and deep-scan spam testing. For enterprise environments, it functions as a critical gatekeeper, ensuring that HTML/CSS structural integrity is maintained despite the varying rendering engines (Gecko, WebKit, Trident) used by different recipients. The platform’s shift toward AI-assisted code suggestions helps developers remediate CSS property conflicts in real-time, positioning it as an indispensable tool for maintaining brand reputation and maximizing engagement in a privacy-first marketing landscape.
Email on Acid, now a core component of the Sinch email portfolio, is a sophisticated pre-deployment platform designed for technical email developers and high-volume marketers.
Explore all tools that specialize in spam filter analysis. This domain focus ensures Email on Acid delivers optimized results for this specific requirement.
An automated checklist that runs 15+ checks including URL validation, image ALT tags, and character set detection.
Deep scan for WCAG 2.1 compliance, providing screen reader previews and color contrast adjustments.
Uses real hardware for mobile previews and precise virtual environments for desktop OS/client combinations.
Sends tests to actual seed lists across 23+ different filters and corporate gateways.
Built-in annotation tools on previews and hierarchical folder management for agencies.
Automatically analyzes image file sizes and suggests compressions to prevent load time latency.
Specific rendering toggle for iOS, Android, and Outlook Dark Mode styles.
Sign up and authenticate via the Sinch dashboard.
Configure your default 'Seed List' for deliverability testing.
Integrate your ESP via API or SMTP for direct test sending.
Upload your first HTML creative or use the URL fetcher.
Run Campaign Precheck to initiate automated link and image scans.
Select target email clients from the library of 100+ devices.
Analyze the Accessibility report for WCAG compliance issues.
Review Spam Filter results against 20+ global filters.
Use the 'Share' feature to generate a public preview link for stakeholders.
Export corrected code or push directly back to your ESP for deployment.
All Set
Ready to go
Verified feedback from other users.
"Users praise the comprehensive nature of Campaign Precheck and its superior accessibility tools, though some find the UI slightly more complex than lighter alternatives."
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