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Litmus is a testing service for web and marketing professionals. It allows people to cross-browser test their websites, and test their email newsletters across a range of email clients and spam filters. | Email on Acid is the most affordable, self-serve email testing platform in the world. We can help you maximize the success of your email marketing efforts by diagnosing and improving your renderability, deliverability, click-throughs and conversions. |
You send us a copy of your email design, either by uploading the HTML or sending us a test email. Within a couple of minutes you'll see screenshots of your email as it's rendered by all the different email clients. Made a change? One click starts a re-test.;PREVIEW IN REAL EMAIL CLIENTS- Litmus shows you screenshots of your email newsletter as it looks across all major email clients.;CHECK ON MOBILE DEVICES- See your email on the most popular mobile devices. Litmus even lets you realistically scroll your email on the device.;EVERYTHING IN ONE PLACE- We preview your message on every major mobile device and email client.;LIGHTNING-FAST- If you're trying to fix a rendering problem in your campaign, the last thing you want is to wait for your previews. We run hundreds of servers to ensure our system is the fastest in the industry.;WORKS WITH ANY EMAIL PROVIDER- Litmus is the perfect complement to your email marketing program. As an independent company, our email testing tools are compatible with any email provider, so there's no need to switch. | Preview your email in 8 operating systems, 6 web browsers, and 32 email clients - all within one click.;Preview your email before you send it!-
We manage hundreds of servers and mobile devices to deliver you the fastest results possible.;Our Code Analysis identifies individual lines of code that are not supported in each email client.- Discrepancies are classified as critical, moderate, or minor. Critical errors might adversely affect your layout whereas minor errors might include unsupported fonts, alt, or title tags.;Use our library of tips and tricks to resolve issues - fast!- Since 2008, we've documented tons of quirky nuances that you might encounter when developing your HTML email. Details and work-a-round solutions are provided for each individual client, all from within your test result window!;Link & Image Validation- We'll check to ensure that each of your link and image references are valid.;Spell Check- We support English, Spanish, Dutch, German and French!;Character Conversion- Make sure your special characters remain intact using our free conversion tool. Here's more on that topic.;Code Validation (optional)- When it comes to email, WC3 standards are more important than ever! For this reason, we run a pre-flight check on your email before we process your results.;Client Interpretation- Clients like Outlook 2007 & 2010 convert your original source code making it difficult to identify the cause of rendering issues. With this feature, you can compare your HTML - before and after.;Recommendations- Using our library of known tips and tricks, we'll scan through your source code and make recommendations that will improve your renderability. It's a great way to catch something you might have missed while perusing through your test results. |
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We offer one platform that covers all email-related needs in one place: testing, sending, and in-depth tracking to control how email infrastructure works and performs.

Disposable email and fake email capture for QA and development teams

Mailinator is a disposable email service that allows QA departments to test with 1000's of inboxes.

Is a free, open-source SMTP testing tool built with Go and Vue. It provides a modern web UI for viewing and testing emails, and includes a REST API for integration testing.

MTN Email Verifier is a high-performance tool for ensuring that your email communications reach the right inboxes every time. With the rise of email marketing and automated outreach, maintaining a clean list of deliverable email addresses is crucial. MTN Email Verifier combines syntax validation, domain checks, and server-level SMTP verification to deliver a reliable, real-time solution.

MailMoxie is your platform to identify and fix email deliverability issues. Test emails against 50+ spam triggers, analyze DNS records, and get expert deliverability consulting to ensure your emails reach the inbox, not the spam folder.

Email Deliverability Solutions (Analytics + Managed Services). We’ve helped 16,000+ companies like TikTok & HSBC land over 30B emails in customer inboxes.

Unspam.email is an AI-powered email deliverability and spam testing platform designed to help marketers, developers, and growth teams ensure their emails land in the inbox instead of the spam folder. It provides pre-send testing that evaluates emails across technical setup, content quality, and design, delivering a clear spam score along with actionable recommendations before campaigns are sent. Key features include inbox placement testing across major email providers, blacklist and domain reputation monitoring, SPF, DKIM, and DMARC validation, and cross-device email previews. It also offers an AI-powered heatmap that predicts how recipients are likely to engage with email content, helping optimize layout and improve click-through rates. By identifying deliverability issues early, Unspam.email helps teams protect sender reputation, reduce spam risk, and improve overall email campaign performance.

Email verification API with 15+ checks: disposable detection, scam domain blocking, SPF/DMARC validation, risk scoring, alias detection, and free deliverability tools. 200 free validations/month.

Temp Email Now is a free, privacy-focused web service that provides instant disposable email addresses for OTPs, verification emails, and sign-ups. It works entirely in the browser with no registration, no personal data, and no tracking. Users can generate temporary inboxes instantly, receive emails in real time, and avoid spam while staying anonymous. Temp Email Now is designed for developers, testers, marketers, and privacy-conscious users who need fast, reliable temporary email access without friction.