Free tools.
Clearer signals.
Practical checks and browser-local planning tools for the parts of email delivery you can inspect before changing a live system.
Explore the toolkitRead what the record, header or report actually shows—and what it cannot prove.
Choose a starting point.
Search by record, workflow or question. Each tool includes a clear boundary and a relevant next read.
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DNS Record Lookup
Look up public DNS answers and distinguish missing records from lookup failures.
Open toolSPF Checker
Inspect your published SPF record, included policies and DNS-lookup limits.
Open toolDKIM Checker
Check the public DKIM key for a selector you know, including key structure and strength.
Open toolDMARC Checker
Inspect the exact domain’s policy, alignment settings and reporting destinations.
Open toolSPF Record Generator
Build one draft SPF record from the sending IPs and include domains you provide.
Open toolDMARC Record Generator
Create a draft policy with explicit reporting addresses and alignment settings.
Open toolEmail Header Analyzer
Read redacted message headers to map hops and reported authentication results.
Open toolDMARC XML Analyzer
Read an aggregate XML report’s date range, source counts, policy and alignment results.
Open toolWarmup Strategy Planner
Build an adjustable sending-volume plan with caps, checkpoints and hold conditions.
Open toolWarmup Seed Calculator
Estimate provider coverage, seed-mailbox capacity and test-send workload.
Open toolTools in your workspace.
Existing provider connections and private monitoring are available through your Sky account where enabled. These are not public lookup tools.
WORKSPACE
Email Delivery Incident Worksheet
Organize a delivery change, the evidence you have and the next bounded investigation step.