Knowledge Base
Guides and documentation for all Provider.tools products.
Email Authentication & DMARC
Complete guide to email authentication: SPF, DKIM, and DMARC — from fundamentals to advanced report analysis.
Attack Defense
The complete guide to our attack-reporting network: report attacks from your servers, block reported attackers automatically, check IPs, integrate firewalls.
- Attack Defense - What it is & how it works
- On your server: fail2ban (reporting & auto-blocking)
- In your firewall: block reported attackers
DNSBL - DNS-based Blacklist
Complete guide to our DNS-based Blacklist service with multi-level reputation scoring: how it works, scoring model, return codes, mail server integration, and delisting.
DNS — Domain Name System
Complete guide to DNS: How the internet's phone book works, all record types explained in detail, propagation, security with DNSSEC, and troubleshooting.
- DNS Fundamentals — How the Internet's Phone Book Works
- DNS Record Types — Complete Reference
- DNS Propagation — Why Changes Take Time
Webhook Tester
Complete guide to the Webhook Tester: receive, inspect, debug, and test HTTP webhooks and API callbacks in real-time.
REST API - Programmatic Access
Complete guide to the provider.tools REST API: Authentication, endpoints, rate limits, and code examples for DNS, SSL, blacklist, IP Lookup, ASN Lookup, and DMARC checks.