Mailsac
Email testing software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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$18 per month
Free Trial unavailable
Free version
Small
Medium
Large
- Information technology and software
- Media and communications
- Professional services (engineering, legal, consulting, etc.)
What is Mailsac
Mailsac is an email testing service that provides disposable and persistent inboxes for receiving and inspecting email during development, QA, and automated tests. It is used by software teams to validate transactional email flows (such as sign-up, password reset, and notifications) and to debug deliverability and content issues. The product supports programmatic access to messages via API and can be integrated into CI/CD pipelines. It also offers options for private domains/inboxes to reduce exposure when testing with real systems.
API-friendly email validation
Mailsac provides APIs that let teams fetch, search, and assert on received messages as part of automated tests. This supports repeatable testing for common workflows like account verification and password resets. Programmatic access reduces reliance on manual inbox checks during QA. It fits well when email testing needs to run inside CI pipelines.
Disposable and persistent inboxes
The service supports quick, throwaway inboxes for ad hoc testing as well as persistent inboxes for ongoing environments. This flexibility helps teams separate one-off debugging from stable test fixtures. Persistent addresses can be embedded into automated test suites without frequent reconfiguration. Disposable inboxes reduce setup time for developers.
Supports private testing setups
Mailsac offers configurations such as private inboxes and custom domains (plan-dependent) to keep test email traffic more controlled. This can be useful when testing systems that send sensitive links or tokens. Private setups also help reduce interference from other users that can occur with shared/public inbox concepts. It is suited to teams that need more isolation than purely public inbox testing.
Not a full email suite
Mailsac focuses on receiving and inspecting email for testing rather than providing end-to-end email marketing or campaign management. Teams looking for template design workflows, audience management, or advanced analytics typically need separate tools. It is primarily oriented to QA and engineering use cases. This narrower scope can be limiting for marketing-led email programs.
Advanced features are plan-gated
Capabilities such as private domains/inboxes and higher usage limits generally depend on paid tiers. For teams with high-volume automated testing, costs can increase as message volume and retention needs grow. Budgeting may be less predictable if test suites generate large numbers of emails. Some organizations may need to compare pricing against alternative test inbox services.
Requires integration effort
To get the most value, teams often need to integrate the API into test frameworks and CI jobs. This adds initial engineering work compared with purely manual inbox checking. Organizations without automated testing practices may not realize the full benefit. Email assertions can also require ongoing maintenance as templates and flows change.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Free | Free (no expiration) | Public unlimited inboxes; 1,500 Ops/month; 1 enhanced address; 50 messages storage; Community support. |
| Indie | $18 per month / $169 per year (annual billed, "21% savings" shown when billed yearly) | Unlimited private inboxes; 25,000 Ops/month; 5 team seats; 1 custom domain; 50 enhanced addresses; 1,000 messages storage; Credit card billing. |
| Business | $89 per month / $840 per year (annual billed, 21% savings) | Unlimited private inboxes; 2,000,000 Ops/month; 15+ team seats; 5 custom domains; 250 enhanced addresses; 5,000 messages storage; SSO (SAML) and email support; Credit card billing. |
| Enterprise | Starting at $295 per month (equivalent) / $3,540 per year (billed yearly; starting price) | Custom/negotiated Enterprise plans; example limits shown (8,000,000 Ops/month, 12+ custom domains, 480 enhanced addresses, 12,000 messages storage); SSO; 2 hours phone support included; Invoice / Purchase Order / Wire Transfer / Credit Card payment; Dedicated-instance option available. |
Additional add-ons (listed on official pricing page):
- Additional Ops: 500,000 Ops for $25 monthly or $300 yearly.
- Custom domains add-on: $7 monthly or $75 yearly.
- Enhanced addresses add-on: Add 250 enhanced addresses for $7 monthly or $50 yearly.
- Message storage add-on: Add 5,000 storage for $10 monthly or $100 yearly.
Notes: All prices shown in USD on the official pricing page. Enterprise plans are billed yearly and may require contacting sales for exact configuration and pricing.
