mailboxlayer API
Transactional email software
Email verification software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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$7.99 per month
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What is mailboxlayer API
mailboxlayer API is a REST API for validating and verifying email addresses before they are stored or used for outbound messaging. It is typically used by developers and product teams to reduce invalid sign-ups, improve list hygiene, and lower bounce rates by checking address syntax, domain/MX records, and related signals. The product is delivered as an API service rather than a full email sending or campaign management platform. It is commonly embedded into web forms, CRM/lead capture workflows, and backend data pipelines.
Developer-friendly verification API
The product focuses on a single-purpose email verification API that can be called from applications and backend services. This makes it straightforward to integrate into sign-up forms, lead capture, and data enrichment workflows. Teams that do not need a full marketing or transactional email suite can adopt it with less operational overhead. The API-first delivery model fits common engineering deployment patterns.
Core validation signals available
mailboxlayer provides checks commonly used for email validation, such as format/syntax validation and domain-level verification (e.g., DNS/MX presence). These signals help identify obviously invalid addresses before they enter a database or are used for sending. Using these checks can reduce hard bounces and improve downstream deliverability metrics. It supports use cases where verification is needed independently of an email sending provider.
Works across multiple systems
Because it is exposed as an HTTP API, mailboxlayer can be used across different applications, languages, and platforms. This supports centralized verification for multiple products or business units without tying verification to a specific email delivery stack. It can be used both in real-time (form validation) and batch processes (list cleaning). This flexibility is useful when verification must be shared across tools.
Not a sending platform
mailboxlayer does not function as a transactional email delivery service or marketing automation platform. Organizations still need separate infrastructure for message composition, sending, deliverability management, and analytics. Buyers comparing it to broader email platforms may find missing capabilities such as templates, event webhooks, suppression management, and campaign reporting. It is best evaluated as a verification component rather than an end-to-end email solution.
Limited workflow and UI features
As an API-centric product, it typically offers fewer built-in workflow tools than platforms that include list management, segmentation, and automation. Non-technical teams may require engineering support to operationalize verification in business processes. If a team expects a rich UI for bulk list cleaning and governance, additional tooling may be needed. This can increase implementation effort for business-led deployments.
Verification depth may vary
Email verification APIs often differ in how deeply they can validate mailbox existence and how they handle catch-all domains, role-based addresses, and disposable email providers. Depending on the plan and available signals, results may be probabilistic rather than definitive for some domains. Teams with strict compliance or deliverability requirements may need to test accuracy against their own datasets. This can require additional monitoring and tuning in production.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Free | $0.00 per month (also shown as $0.00 yearly) | 100 API requests / month; Syntax & Typo Check; Free & Disposable Provider Databases; Quality Score; Real-time SMTP / MX-records check; 256-bit HTTPS encryption; No support. (Described as a "trial version" without time limit on site.) |
| Starter | $7.99 per month ($86.99 yearly) | 2,500 API requests / month; overage: + $0.0063920000 per extra request; Standard support; Syntax & Typo check; Free & Disposable DB; Quality Score; Real-time SMTP / MX-records check; Catch-all detection. |
| Basic | $14.99 per month ($161.99 yearly) | 5,000 API requests / month; overage: + $0.0059960000 per extra request; Standard support; same validation features; optional Platinum Support (shown as $479.88 billed annually when selected). |
| Professional Plus | $74.99 per month ($787.99 yearly) | 50,000 API requests / month; overage: + $0.0029996000 per extra request; Standard support; includes Bulk endpoint (25 emails); optional Platinum Support (shown as $599.88 billed annually). |
| Enterprise Plus | $249.99 per month ($2,549.99 yearly) | 250,000 API requests / month; overage: + $0.0019999200 per extra request; Standard support; Bulk endpoint (100 emails); optional Platinum Support (shown as $719.88 billed annually); custom volume requests: contact sales. |
Notes: The pricing page states "Choose annual billing and save upto 15%" and shows annual discounts per plan. All information taken from the vendor's official pricing page.
Seller details
apilayer GmbH
Vienna, Austria
Private
https://mailboxlayer.com/
https://x.com/apilayer
https://www.linkedin.com/company/apilayer/
