Tools

The Tools section lives in your dashboard under /app/tools. Everything runs server-side over DNS-over-HTTPS — nothing is stored and no third-party API keys are required.

Email Auth — SPF, DKIM, DMARC

Enter any domain and we'll fetch SPF, DMARC, and scan ~20 common DKIM selectors (Google, Mailchimp, SendGrid, Amazon SES, Postmark, Mailgun, and more). The checker validates the SPF qualifier, DMARC policy (none / quarantine / reject), and DKIM record syntax. Use it on every domain you send from before warming up.

Optional DKIM selectors can be entered as a comma-separated list (e.g. default, s1, mta) if your provider uses something non-standard.

MX Lookup

Resolves a domain's MX records, sorts them by priority, and looks up the A record for each mail host. A domain with no MX records cannot receive email — useful when you're seeing bounces and want to know whether the recipient domain is actually reachable.

IP Blacklist Check

Queries an IPv4 address against major DNSBL providers — Spamhaus, SpamCop, Barracuda, SORBS, UCEPROTECT, and others. A "listed" result tells you why your relay's reputation is suffering and which provider to request delisting from.

Email Validator

Combines syntax validation, MX existence, disposable-domain detection (Mailinator, 10minutemail, etc.) and role-account detection (info@, admin@, postmaster@). Result is a single verdict: deliverable, risky, or undeliverable.

Header Analyzer

Paste raw headers from any email and the analyzer unfolds Received hops, computes hop-by-hop delay, and extracts the Authentication-Results verdicts for SPF, DKIM, and DMARC. This is the fastest way to diagnose a "why did this land in spam?" report from a customer.

Generators

• Base64 encoder / decoder — useful for raw SMTP AUTH PLAIN testing and data-URI image embeds.
• List-Unsubscribe header generator — builds RFC 8058 one-click headers Gmail and Yahoo require for bulk senders.

Where to go next

• Deliverability guide — interpret the results from the Auth checker.
• Connect SMTP — wire up a sending server in under five minutes.