Toolbox
Choose the right tool for the job — what it does, when to use it, and how it connects to Learn, Solve, and step-by-step workflows.
Open the toolbox
Find the right tool fast — inspectors, validators, monitors, and platforms organized by job.
ESPs
Sending platforms and ESP control planes.
- SendGridTransactional and marketing email platform with APIs, SMTP, and authentication tooling.
- MailgunDeveloper-focused email API for transactional sending and inbound routing.
- Amazon SESHigh-scale cloud email sending with fine-grained infrastructure control on AWS.
- PostmarkReliable transactional email with strong deliverability defaults and message streams.
- MailerSendModern transactional email platform with templates, SMTP, and analytics.
- MailchimpMarketing platform for campaigns, audiences, and automation journeys.
- MailerLiteEmail marketing and automation for growing lists and newsletters.
Automation
Orchestrate journeys and operational workflows.
Email Validation
Verify addresses and clean lists before you send.
- ZeroBounceEmail validation and list hygiene service that scores address quality before you send.
- NeverBounceEmail verification platform for real-time and bulk list validation.
- BouncerEmail verification service focused on accuracy and developer-friendly APIs.
- EmailableEmail verification and list cleaning with batch and API workflows.
Monitoring
Watch reputation, inbox signals, and sender dashboards.
Inbox Placement
Test where campaigns land across providers.
Infrastructure
Hosting, DNS providers, and mail plumbing.
Testing
Score messages and run deliverability checks.
Analytics
Measure engagement and campaign performance.
Authentication
Inspect SPF, DKIM, DMARC, and related identity signals.
- dmarcian inspectorsDMARC-focused inspectors and educational tooling from dmarcian.
- EasyDMARC free toolsFree DMARC/SPF/DKIM lookup and analysis utilities from EasyDMARC.
- PowerDMARC free analyzersFree authentication analyzers from PowerDMARC for SPF, DKIM, and DMARC.
- LearnDMARCInteractive DMARC learning and inspection helper for operators new to enforcement.
- DKIMCoreDKIM key and signature oriented validation utilities.
- Kitterman SPF validatorClassic web SPF policy evaluator used by operators for syntax checks.
- URIports toolsDMARC and related reporting tools for operators collecting aggregate feedback.
DNS
Look up mail-critical DNS and authentication records.
- MXToolboxPopular DNS and mail diagnostics suite for SPF, DMARC, blacklist, and MX checks.
- digCLI DNS lookup utility for authoritative and recursive inspection of mail-related records.
- nslookupInteractive DNS lookup utility commonly used for quick MX and TXT checks.
- Google Admin Toolbox DigBrowser-based dig-style DNS lookup from Google’s Admin Toolbox.
- Google Admin Toolbox CheckMXGoogle Admin Toolbox Check MX for inbound mail DNS sanity checks.
Development
CLI and developer utilities for mail debugging.
Utilities
Handy operators’ tools for day-to-day checks.