Litmus Spam Testing

Scan your emails across key spam filters to identify and resolve issues before you press send.

Sign up free

Make it to the inbox, not the spam folder

Litmus scans your emails against 25+ different tests, identifies issues that might keep you from the inbox, and provides actionable advice for how to fix them. Get the peace of mind that comes with knowing if your brand is likely to reach the inbox.

Magnify green

Know if you’re blacklisted

Check your IP addresses and domain names against common blacklists, and get notified if any of them could affect delivery.

Mail green

Get actionable advice

Utilize hands-on, practical advice for how to fix issues and improve your email’s chances of reaching the inbox—even if you’re not a delivery expert (yet).

Inf green

Set your infrastructure up for success

Validate that your email is being properly authenticated using DKIM and SPF, and ensure your DMARC record is set up correctly.


of emails show at least one spam-related issue that could impact deliverability

Source: Analysis of 1.5 million emails tested with Litmus Spam Testing

Pre-screen your messages across major spam filters

Tests include spam filters from inbox providers and webmail services, as well as score-based filters that are frequently used for corporate spam filtering.

Score Filters

  • Barracuda
  • Microsoft Exchange
  • MessageLabs
  • Outlook Desktop
  • Spam Assassin

Placement Filters

  • AOL Mail
  • Gmail
  • GMX
  • GoDaddy
  • G Suite
  • Google Inbox
  • Office 365
  • Outlook
  • Yahoo!
  • Yandex
Esps spam testing

*More ESPs coming soon!

Integrate Spam Testing with your email service provider

Say goodbye to switching between email tools to run a spam test. With ESP Integrations for Spam Testing, it’s never been easier—or faster—to run a comprehensive and accurate spam test. Simply connect your email service provider (ESP) to Litmus, select the draft email to test, and let Litmus do the rest.


Spam Testing for Designers

Get actionable deliverability tips

Get your emails scanned by all major spam filters—and spot and fix potential issues—before you hit send.

Reach the inbox more consistently

Ensure your designs are seen by as many subscribers as possible.

Litmus for Designers

Spam Testing for Marketers

Improve your delivery rates

Scan your emails across all major spam filters and identify issues before you send.

Get actionable deliverability tips

Understand what’s causing delivery issues and receive hands-on recommendations for how to fix them—even if you’re not a delivery expert (yet).

Increase the ROI of every campaign

Improve inbox placement, reach more subscribers, and increase your overall email performance.

Litmus for Marketers

Spam Testing for Agencies

Identify issues keeping your clients’ emails from the inbox

Scan your clients’ emails across all major spam filters and quickly identify potential causes for deliverability issues.

Get actionable deliverability tips

Utilize actionable suggestions you can take to your clients to improve deliverability and increase campaign performance.

Litmus for Agencies