Detect and block disposable, temporary, and fake email addresses in realtime with IsTempMail's JSON API and WordPress plugin to fight spam, fraud, and free trial abuse.
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Get ListedIsTempMail is a specialized service designed to detect and block disposable, temporary, and fake email addresses in realtime. It solves the problem of spam, fraudulent registrations, and free trial abuse by providing a simple JSON API and a WordPress plugin that validate email addresses against a constantly updated database of over 124,000 known disposable email domains. The service is built for developers, SaaS companies, and any online business that relies on email verification to maintain the integrity of user signups and prevent abuse.
Huge Database of Disposable Domains: IsTempMail maintains a database of more than 124,000 domains known for providing temporary or disposable email addresses. This extensive list is continuously updated, with 5 to 20 new providers added daily and over 800 entries added in the last four weeks alone. The database is the core of the service, ensuring high detection rates.
Simple JSON API: The API is designed for ease of use. A single endpoint (/api/check/API_TOKEN/domain) accepts a POST request with an email address or domain and returns a JSON response containing the domain name, a blocked boolean flag, and an optional unresolvable flag for domains that cannot be resolved. This minimalistic approach makes integration straightforward for developers.
WordPress Plugin: For WordPress users, IsTempMail offers a free plugin called "Block Temporary Email" available on the WordPress plugin repository. Installation requires three steps: install the plugin, sign up for an API token, and enter the token in the WordPress admin. The plugin automatically blocks disposable email addresses during registration, comments, and other forms.
API Libraries: To accelerate integration, IsTempMail provides official API libraries for JavaScript (npm package) and PHP (GitHub repository). These libraries wrap the API calls, making it even easier for developers to add disposable email detection to their applications.
Real-time Validation: The service operates in realtime, meaning that when a user submits an email address, the API checks it against the database and returns a result within milliseconds. This allows businesses to reject disposable emails at the point of entry, preventing fake accounts before they are created.
Unresolvable Domain Detection: Beyond simply checking against the blocklist, the API also identifies domains that are unresolvable (i.e., they do not have valid MX records). This catches additional fake or mistyped email addresses, providing an extra layer of validation.
Fair Pricing with Free Tier: IsTempMail offers a free plan with 200 API requests per month, no credit card required. Paid plans start at $5/month for 5,000 requests, scaling up to $50/month for 1,000,000 requests. The pricing is fixed monthly, with the ability to upgrade, downgrade, or cancel anytime. Non-profits can request a discount.
To use IsTempMail, a user first signs up for an account on the website to obtain an API token. The token is then used to authenticate API requests. For developers, integration involves making a POST request to the check endpoint with the email address or domain to validate. The API returns a JSON object indicating whether the domain is blocked. For WordPress users, the process is even simpler: install the plugin, enter the API token in the settings, and the plugin automatically validates email addresses on registration forms, comment forms, and other input fields. The service updates its database continuously, so no manual maintenance is required. Users can also report new disposable email domains through their account dashboard or via email, contributing to the community-driven blocklist.
SaaS Companies Preventing Free Trial Abuse: A B2B SaaS startup offering a 14-day free trial can use IsTempMail to block users who sign up with temporary email addresses to exploit the trial repeatedly. By integrating the API at registration, the company ensures that only genuine users with permanent email addresses access the trial, protecting revenue and resource allocation.
E-commerce Sites Reducing Fake Orders: An online store that offers discounts or promotional codes for first-time buyers can use the WordPress plugin to block disposable email addresses during checkout. This prevents users from creating multiple accounts with temporary emails to claim discounts repeatedly, reducing fraud and inventory loss.
Community Forums and Membership Sites: A membership-based community platform can integrate the API to verify email addresses during user registration. This keeps the community free from spam accounts and bots that use disposable emails, maintaining a high-quality user base and reducing moderation overhead.
Marketing Teams Cleaning Email Lists: A marketing agency managing email campaigns for multiple clients can use the API to validate email addresses before sending newsletters. By filtering out disposable emails, they improve deliverability rates, reduce bounce rates, and ensure that marketing efforts reach real inboxes.
Developers Building Registration Systems: A developer creating a custom registration system for a web application can use the npm or PHP library to quickly add disposable email detection. The library handles API calls and response parsing, allowing the developer to focus on other features while ensuring robust email validation.
IsTempMail is designed for developers, SaaS companies, e-commerce businesses, and any organization that collects email addresses and wants to prevent abuse from temporary email services. It is particularly well-suited for small to medium-sized businesses that need a reliable, easy-to-integrate solution without the complexity of enterprise fraud detection systems. Alternatives include services like ZeroBounce, NeverBounce, and Kickbox, but IsTempMail differentiates itself with a dedicated focus on disposable email detection, a free tier, and a simple API. The service is technical enough for developers but also accessible to non-technical users through the WordPress plugin.
