MailTester vs Unspam.email
MailTester
mailtester.eu
Unspam.email
unspam.emailSide by side
| Figure | MailTester | Unspam.email |
|---|---|---|
| Price from | Free | $5/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 7 |
| Spec score · Email Testing Software | 7.6 (#21) | 8.3 (#10) |
| Authentication checks | It checks SPF, DKIM, DMARC, domain alignment, reverse DNS, and forward-confirmed reverse DNS. | The product checks SPF, DKIM, DMARC, BIMI, reverse DNS, list-unsubscribe headers, broken links, short URLs and domain age or suffix. |
| Intended users | The maker invites users to test deliverability, monitor multiple domains, or request API access and a tailored plan. | The company describes the platform as serving marketers, founders, agencies, and product teams. |
| Privacy | The maker describes the .eu edition as configured for full GDPR compliance. | The privacy policy says submitted test emails, including their headers and message content, are collected and stored to provide the service. |
| Purpose | MailTester checks why emails may land in spam and returns a deliverability score out of 10. | Unspam is an email deliverability platform that checks spam signals, sender authentication, blacklists, previews, heatmaps, and inbox placement. |
| Spam analysis | Messages are analyzed by Rspamd, with a spam score and a list of triggered rules. | Its spam-test report analyzes email content and technical setup and organizes findings into overview, preview, heatmap, AI-assistant and historical-result views. |
| Support | The contact page says inquiries receive a reply within one business day. | The company lists support chat and [email protected] for support or product inquiries. |
Plans
Unspam.email
- FreeFree
- No accountFree
- Custom plan$5 a month
- Basic$9 a month
- Business$19 a month
- Agency$29 a month
- White LabelPriced on request
In their own words
MailTester
MailTester checks why email may reach spam and returns a deliverability score out of 10. To run a test, generate a disposable address, send the message there and receive a report in seconds. Scoring starts at 10, subtracts points for detected issues, and explains penalties with suggested fixes. Authentication checks include SPF, DKIM, DMARC, domain alignment, reverse DNS and forward-confirmed reverse DNS. Sending IPs are checked against Spamhaus, SpamCop, Barracuda and other DNS blocklists. Content analysis covers HTML, text-to-image ratio, links, subject, List-Unsubscribe and Message-ID. Rspamd supplies a spam score and triggered rules. Newsletter checks include one-click List-Unsubscribe under RFC 8058, message size and text-image ratio. MailTester offers web, API and self-hosted platforms. Its API creates test addresses and reads report status and scores as JSON. The free plan costs nothing, needs no account and provides 25+ checks per test.
Unspam.email
Unspam.email is an email deliverability platform for examining spam signals, sender authentication, blacklists, previews, and inbox placement. Spam tests assess authentication, sender reputation, blacklists, and message content, then show which checks affected the score. Inbox placement tests send a campaign to seed mailboxes at Gmail, Outlook, Yahoo, and other providers and report where it landed. Email previews cover rendering across more than 50 real clients and devices in light and dark modes. Scheduled tests can track placement and spam scores and send alerts by email when results decline. Its API has 39 endpoints across seven areas and can test mail sent through SES, Postmark, SendGrid, Mailgun, or a sender’s own SMTP setup; an MCP server lets compatible AI clients run tests and retrieve results. The free plan includes 21 tests per month, unlimited sender accounts, and 14-day data retention, but excludes DMARC monitoring and full API access. Custom costs $5 a month, with a $5 monthly minimum and pay-per-test rates.