MailSlurp vs Unspam.email
MailSlurp
mailslurp.com
Unspam.email
unspam.emailSide by side
| Figure | MailSlurp | Unspam.email |
|---|---|---|
| Price from | $19.99/mo | $5/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Plans published | 9 | 7 |
| Spec score · Email Testing Software | 8.9 (#5) | 8.3 (#10) |
| Automation | Webhooks, filtering rules, forwarding, automatic replies and attachment automations route and process messages. | Scheduled tests can track placement and spam scores and email alerts when results decline. |
| Headquarters | Saue, Harjumaa, Estonia | The company lists 167 Madison Avenue, Suite 205, New York, New York 10016, United States, and a Barcelona office. |
| Inbox placement | Inbox-placement tests compare delivery across personal and business Gmail and Microsoft mailboxes. | Inbox-placement tests send campaigns to seed mailboxes at Gmail, Outlook, Yahoo and other providers and report the folder reached. |
| Integrations | The integrations directory lists 79 items, including SDKs, Playwright, Cypress, Selenium, BrowserStack, Zapier, Power Automate, UiPath, Postman, GraphQL and webhooks. | The API is designed to receive real messages from SES, Postmark, SendGrid, Mailgun or a customer’s SMTP system. |
| Rating on G2 | 2.0 out of 5 from 2 reviews | 4.8 out of 5 from 32 reviews. |
| Rating on GetApp | 0 out of 5 from 0 reviews | 5.0 out of 5 from 1 review. |
| Security | The security policy says data at rest is encrypted with AES-256, data in transit uses TLS/SSL, and daily backups are stored in AWS S3. | The privacy policy says stored data is kept on services and providers certified to ISO/IEC 27001:2013, PCI DSS, SOC 1 Type II, and SOC 2 Type II or higher. |
| Support | The support page offers guides and direct contact for account, billing, delivery, and technical issues. | The company lists support chat and [email protected] for support or product inquiries. |
| What it does | MailSlurp provides programmable email addresses, phone numbers, messaging APIs and testing workflows for developers and QA teams. | Unspam.email is a deliverability platform combining spam tests, authentication and blacklist checks, previews, heatmaps and inbox-placement testing. |
Plans
MailSlurp
- FreeFree
- FreeFree
- Starter$19.99 a month
- Starter$19.99 a month
- Pro$49.99 a month
- Pro$49.99 a month
- Growth$129.99 a month
- Growth$129.99 a month
- EnterprisePriced on request
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
MailSlurp
MailSlurp provides tools to build, test, and automate email and SMS workflows. Users can create temporary or permanent inboxes and handle messages through APIs, SDKs, SMTP, IMAP, and webhooks. It supports end-to-end tests for scenarios including OTP, MFA, magic links, and load testing, as well as device previews, email audits, and inbox placement checks. Pipelines can route messages and attachments using webhooks, forwarding, and automatic replies. AI extraction can turn emails and attachments such as PDFs and images into structured JSON using prompts, schemas, and OCR. Listed integrations include Playwright, Cypress, Selenium, HubSpot, Braze, Mailchimp, Zapier, and AI assistants through MCP. A REST API and official SDKs cover several programming languages. The free plan has capped allowances, including 500 received emails and 1,000 sandbox sends per month. Starter costs $19.99/mo; custom domains and phone numbers require Pro on Free and Starter plans. MailSlurp is web- and API-accessible.
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.