← Complete Engineering Directory RFC 5321 Diagnostic Suite Free SMTP Server Test Tool & Live Conversation Inspector Connect to SendGrid, Mailgun, Amazon SES, Brevo, Postmark, Microsoft 365, Google Workspace, or any custom SMTP server and inspect the exact client/server socket conversation in real-time. Diagnose authentication rejections, TLS cipher mismatches, port blocks, and sender/recipient relay failures […]
← Back to Complete Engineering Directory Deliverability Engine • Link & HTML Security Free Outbound Email HTML & Tracking Link Sanitizer: Scan Hops, Pixels & Deliverability Traps By Fred Dawson • 100% Free Client-Side Security Tool • Instant Analysis Paste your campaign HTML and get a deliverability-safe version back. This sanitizer flags hidden 1×1 tracking […]
← Back to Complete Engineering Directory RFC 8058 • Google & Yahoo 2026 Mandate Free RFC 8058 One-Click List-Unsubscribe Header Generator & Bulk Sender Grader By Fred Dawson • Updated for 2026 Google & Yahoo Bulk Sender Enforcement • 5 Min Tool Generate the two headers Gmail and Yahoo require for bulk senders: List-Unsubscribe (https […]
Generate a tailored AI prompt for your landing page, sales funnel, or systeme.io page in seconds. Free, no signup required. Works with Claude, ChatGPT, and Gemini.
Calculate email marketing ROI in seconds. Model list size, open rates, CTR, conversion rates, and AOV against escalating ESP contact tiers vs flat-rate unmetered AutoSMTP bare-metal clusters.
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Check if your domain name or tracking domain is blacklisted on Spamhaus DBL, SURBL, URIBL, and SpamEatingMonkey. Prevent your emails from landing in spam due to domain reputation flags.
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Plan how many sending mailboxes and secondary domains you need for target outbound volume, meeting goals, ESP mix, and safe daily send caps.