Trushilla Labs · v3.6
Email Deliverability Toolkit
Fifteen practical authentication, DNS and deliverability tools. Most run fully in your browser; three optional DNS checks use public DNS-over-HTTPS.
SPF Record Generator
Build a standards-aware SPF TXT record from common mechanisms.
Open tool →v3.6 ToolkitSPF Lookup Counter
Estimate DNS-triggering SPF mechanisms and flag the RFC lookup limit.
Open tool →v3.6 ToolkitSPF Flattening Planner
Create a safe flattening and maintenance plan without pretending static IP data never changes.
Open tool →v3.6 ToolkitDKIM DNS Record Generator
Format a DKIM TXT record or delegated CNAME target from an existing public key.
Open tool →v3.6 ToolkitDMARC Policy Wizard
Generate a DMARC policy with aggregate and forensic reporting controls.
Open tool →v3.6 ToolkitMX Lookup
Query live MX records through DNS-over-HTTPS and display preference order.
Open tool →v3.6 ToolkitReverse DNS (PTR) Checker
Query the PTR record for an IPv4 address and show the reverse lookup name.
Open tool →v3.6 ToolkitHELO/EHLO Validator
Compare a sending IP, EHLO hostname, forward DNS and reverse DNS.
Open tool →v3.6 ToolkitMTA-STS Policy Generator
Generate the DNS TXT record and HTTPS policy body for inbound SMTP TLS enforcement.
Open tool →v3.6 ToolkitTLS-RPT Record Generator
Generate the SMTP TLS reporting DNS TXT record.
Open tool →v3.6 ToolkitEmail Header Analyzer
Inspect pasted headers for authentication results, routing hops and common identity evidence.
Open tool →v3.6 ToolkitSMTP Bounce Analyzer
Classify a pasted SMTP diagnostic and link into the v3.4 error encyclopedia.
Open tool →v3.6 ToolkitWarm-up Volume Calculator
Build a conservative daily sending ramp from a starting volume and growth rate.
Open tool →v3.6 ToolkitEmail Authentication Evidence Validator
Evaluate SPF, DKIM and DMARC evidence from Authentication-Results headers.
Open tool →v3.6 ToolkitIP Blacklist & Delisting Resource Center
Prepare an IP remediation checklist and open the maintained official delisting directory.
Open tool →