Developer API Tools
Tools for send, DNS, and webhooks
100 free browser tools for DNS auth, deliverability, SMTP, webhooks, payloads, and migration — built for teams shipping transactional email with MailShrine Developer API.
DNS & Auth Checkers
Live checks for SPF, DKIM, DMARC, MX, BIMI, and overall auth health.
12 tools →
DNS Generators
Build paste-ready SPF, DKIM, DMARC, and related DNS records.
8 tools →
Deliverability Testers
Inbox placement, spam, blacklist, and header-path diagnostics.
10 tools →
Webhook Tools
Inspect payloads, verify signatures, and simulate delivery events.
10 tools →
API Playground
Try send, auth, and inspect responses without leaving the browser.
10 tools →
SMTP Tools
Probe SMTP connectivity, TLS, and relay settings before production.
8 tools →
Header & MIME Tools
Decode MIME, analyze EML, and inspect raw message structure.
8 tools →
Payload & Encoding Helpers
JSON, JWT, hashing, and encoding helpers for API and webhook work.
10 tools →
Template & Preview
Preview HTML email, check mobile layout, and validate template variables.
8 tools →
Calculators & Estimators
Credits, volume, cost, and deliverability math for planning sends.
8 tools →
Migration Helpers
Map payloads and settings when switching email providers.
8 tools →