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ByteShield
API to block disposable fake emails and invalid mail domains
Fake signups and throwaway emails (like Mailinator or 10MinuteMail) ruin email deliverability and pollute databases ByteShield API intercepts bad emails instantly at signup using FastAPI and async DNS checks. ๐ Live MX Verification: Non-blocking async DNS lookup to verify active mail servers. ๐ฆ Bulk Support: Validate up to 50 emails concurrently in one request. Includes a free tier on RapidAPI for testing and small apps.
Hey Product Hunt community! ๐ByteShield API is an ultra-fast, developer-focused microservice built to block temporary burner emails (like 10MinuteMail or Mailinator) and dead mail domains right at the signup form before they hit your database.โ๏ธ Technical Architecture & Speed OptimizationsMost email validation tools rely on disk-based database queries or blocking HTTP calls that delay registration workflows. ByteShield was designed around three technical pillars:$O(1)$ In-Memory Filtration: On boot, the server loads a curated array of 3,000+ known disposable email domains into a RAM-based Python set. Blocklist lookups take under 1 millisecond with zero database bottlenecks.Non-Blocking Async DNS Lookup: If a domain passes the RAM check, the API uses dns.asyncresolver to query active Mail Exchange (MX) records. Because it runs asynchronously on an ASGI event loop (FastAPI/Uvicorn), the main thread remains unblocked to handle high concurrent traffic.Concurrency-First Bulk Processing: The /verify-bulk endpoint processes arrays of up to 50 email addresses concurrently in a single POST request using async task gatherers.๐ ๏ธ API Capabilities & Syntax HandlingStrict Regex Validation: Rejects RFC-non-compliant syntax instantly before executing network calls.Implicit MX Fallback: Handles edge cases where domain hosts run mail servers directly on A/AAAA records without explicit MX entries.Deterministic Action Tags: Every response provides an easy-to-parse action field (ALLOW, BLOCK, or INVALID_SYNTAX) for immediate conditional logic in your code. ๐ Sample JSON Payload: { "email": "[email protected]", "is_disposable": true, "mx_valid": false, "action": "BLOCK" } ๐ Pricing & Dev Sandbox We offer a Free Tier (100 requests/month) with full access to both single and bulk verification endpoints so you can benchmark response times directly in postman or cURL.
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About ByteShield on Product Hunt
โAPI to block disposable fake emails and invalid mail domainsโ
ByteShield was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #120 on the daily leaderboard. Fake signups and throwaway emails (like Mailinator or 10MinuteMail) ruin email deliverability and pollute databases ByteShield API intercepts bad emails instantly at signup using FastAPI and async DNS checks. ๐ Live MX Verification: Non-blocking async DNS lookup to verify active mail servers. ๐ฆ Bulk Support: Validate up to 50 emails concurrently in one request. Includes a free tier on RapidAPI for testing and small apps.
ByteShield was featured in Email (36.7k followers), API (98.4k followers) and Security (2.8k followers) on Product Hunt. Together, these topics include over 23.7k products, making this a competitive space to launch in.
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Hey Product Hunt community! ๐ByteShield API is an ultra-fast, developer-focused microservice built to block temporary burner emails (like 10MinuteMail or Mailinator) and dead mail domains right at the signup form before they hit your database.โ๏ธ Technical Architecture & Speed OptimizationsMost email validation tools rely on disk-based database queries or blocking HTTP calls that delay registration workflows. ByteShield was designed around three technical pillars:$O(1)$ In-Memory Filtration: On boot, the server loads a curated array of 3,000+ known disposable email domains into a RAM-based Python set. Blocklist lookups take under 1 millisecond with zero database bottlenecks.Non-Blocking Async DNS Lookup: If a domain passes the RAM check, the API uses dns.asyncresolver to query active Mail Exchange (MX) records. Because it runs asynchronously on an ASGI event loop (FastAPI/Uvicorn), the main thread remains unblocked to handle high concurrent traffic.Concurrency-First Bulk Processing: The /verify-bulk endpoint processes arrays of up to 50 email addresses concurrently in a single POST request using async task gatherers.๐ ๏ธ API Capabilities & Syntax HandlingStrict Regex Validation: Rejects RFC-non-compliant syntax instantly before executing network calls.Implicit MX Fallback: Handles edge cases where domain hosts run mail servers directly on A/AAAA records without explicit MX entries.Deterministic Action Tags: Every response provides an easy-to-parse action field (ALLOW, BLOCK, or INVALID_SYNTAX) for immediate conditional logic in your code.
๐ Sample JSON Payload:
{
"email": "[email protected]",
"is_disposable": true,
"mx_valid": false,
"action": "BLOCK"
}
๐ Pricing & Dev Sandbox
We offer a Free Tier (100 requests/month) with full access to both single and bulk verification endpoints so you can benchmark response times directly in postman or cURL.
๐ Test it live on RapidAPI:https://rapidapi.com/byteshield-...
Iโd love to hear your thoughts, test benchmarks, or feedback on any edge-case domains you think we should add to our blocklist!