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Understand your email

Email spam test

Test email with Rspamd and SpamAssassin: authentication, IP reputation, headers and content. Get a detailed report and an HTML preview with images.

Start a check

Free diagnostics

Send a message for analysis

My history

Analysis starts automatically upon receipt. Each address accepts one message.

Your address is prepared automatically. Send a message from your mailing system. The address is valid for 1 hour; maximum message size is 10 MB.

Checks that help

Why test an email before sending

A useful message can go unnoticed if it lands in spam. Testing helps uncover sender, layout and content issues before customers receive it. Check campaigns, store notifications and CRM emails before sending.

  1. 01

    Send a real message

    Use the same service and sender address as your campaign.

  2. 02

    See what to improve

    Start with sender findings, then review text, links and layout.

  3. 03

    Fix and repeat

    Send another test after making changes and compare results in your history.

Understand the details

What the spam test checks

From sender authentication to readability. Find weaknesses before your customers receive the message.

01

Sender authentication

Whether the server is authorised, the signature verifies and the domains align. Results apply to the message actually received.

02

Headers and addresses

Sender details, reply address, date and subject. Find missing or incorrect information that may affect message processing.

03

Structure and encoding

Text readability and a plain-text alternative. A message should remain understandable without its visual layout.

04

Links and images

Link formats, shortened addresses and image descriptions. The check does not visit linked websites.

05

Content and attachments

Active HTML, message size and potentially risky file extensions. Attachments and archives are not opened; this does not replace an antivirus scan.

06

Unsubscribe and spam filter

Rspamd and local SpamAssassin rules, with detailed scores for matched tests. Unsubscribe headers are checked without triggering unsubscribe.

Why a good message can still go to spam

Delivery depends on more than message content. Sending history, domain and IP reputation, complaints, invalid recipients and audience engagement all matter. One test message cannot reliably reveal this information.

The rating helps assess spam signals, while individual checks show what to fix. Review it alongside actual bounces and recipient responses.

How to get a useful result

Send from the same service and domain as your real campaign. Keep the subject, layout, links and signature. Replace customer information with fictional data.

Start with authentication and structural errors, then review content and unsubscribe usability. Fix the cause in your sending system and run a new test. Check IP reputation and audience feedback separately.

Your archive

Check history

Reports are saved for 24 hours.

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General iT is here to help

Found an issue? We can help.

Find help for your task, from server configuration to website and CRM notifications.

01

Server support

Get help with your mail server, its configuration and reliable operation.

Explore the service 02

Integrations and services

Connect your website, CRM and services so notifications and data reach their destination.

Explore the service 03

Complete support

Website and infrastructure maintenance for issues that need a coordinated solution.

Explore the service

Learn more at your own pace

Explore articles about websites, infrastructure and running online projects on our blog.

Read the blog

The bigger picture

Continue your checks

The address, server and message affect different stages of delivery. Check the parts that matter to your task.

Questions and answers

What to know

Who can see the message and report?

The report is available to the check owner for 24 hours. The original message is deleted after analysis; the result and preview can be deleted from history earlier. Use sample data instead of confidential information.

Can I download the message and result?

Yes. JSON and PDF buttons appear below the summary. PDF is convenient to save or share with a specialist. JSON is useful for further processing. PDF includes message text and check results. JSON also includes safe HTML, source and headers; external images and attachments are not downloaded.

How should I send a test message?

Get a one-time address and send one message from your mailing system. Do not forward an old message: forwarding changes the delivery path and may affect authentication. The address lasts one hour and accepts one message up to 10 MB.

What do the rating and statuses mean?

The decimal rating combines filters, authentication, IP reputation and message quality. Red is below 5, yellow is 5–7.9 and green is 8 or above. Missing evidence marks the rating as provisional; its color follows the score. The rating does not guarantee inbox delivery. Passed applies to one specific check. Unknown does not mean passed. Inapplicable checks, such as images in a text-only message, are not errors.

How do message images load?

Safe embedded images appear immediately. External images load automatically through our server when you open the report and are validated before display. Unavailable or unsafe images are omitted. Loading may activate the sender’s open trackers. Desktop, mobile, plain text, HTML source, headers and links are available. Scripts and unsafe images are blocked.

Does every message need unsubscribe headers?

The check may not apply to personal correspondence or service notifications. For subscription campaigns, review the unsubscribe flow and List-Unsubscribe / List-Unsubscribe-Post headers. Our test checks the headers but never triggers an unsubscribe.

Can I test a message again?

Yes. After making changes, get a new address and send a new message. The old report retains the previous result. Reports last up to 24 hours and can be deleted from history.

How long is the result available?

Your report is available in your history for 24 hours. You can delete it earlier if you wish.

Online email spam testing

A spam test is useful before launching a campaign, changing email providers or updating a template. It checks sender authentication and message issues that can affect how an email is assessed. Send directly from your own system for a representative result: forwarding changes delivery information. Use sample data instead of customer information.

How to improve campaign delivery

Fix domain authentication issues, use a clear subject, and review links and unsubscribe options. Then send another test. A good result does not guarantee inbox placement: sender reputation, complaints and list quality also affect delivery. Complement this test with mail server and IP blocklist checks.