Deliverability & DNS
SPF, DKIM, DMARC setup guides, DNS record configuration, inbox placement troubleshooting, and deliverability monitoring for self-hosted email.
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DKIM Record: Setup, Selectors, Key Rotation, and Failure Debugging
A DKIM record publishes a public cryptographic key that proves your email wasn't tampered with in transit. This guide covers setup, selectors, the 255-character DNS problem, key rotation, failure troubleshooting, and CNAME-based automation at scale.
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Alexey Bulygin
Email Deliverability: Authentication, Reputation, and Fixes (2026)
Email deliverability is an infrastructure problem. This guide covers the authentication stack (SPF, DKIM, DMARC), reputation economics, provider-specific intelligence for Gmail/Outlook/Yahoo, and a 24-hour triage plan to get out of the spam folder.
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Alexey Bulygin
SPF Lookup Limit: Fix the 10 DNS Lookup Problem
The SPF lookup limit quietly breaks growing email stacks. Here’s how to diagnose it, avoid bad fixes, and rebuild SPF so mail keeps working.
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Alexey Bulygin
How to Set Up DMARC Without Breaking Email
How to set up DMARC without killing legitimate mail: start in monitor mode, fix alignment, then tighten policy to quarantine and reject.
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Alexey Bulygin
DMARC Fail: Fix Alignment, Forwarding, and SPF
Seeing dmarc=fail in reports or headers? This guide shows how to trace alignment, forwarding, DKIM, and SPF issues without wasting hours in DNS.
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Alexey Bulygin
DMARC RUA: Setup, Reports, and Fixes
DMARC RUA is the reporting address that makes DMARC useful. Here’s how to publish it, read the reports, and fix the failures that hurt deliverability.
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Alexey Bulygin
DKIM Key: Best Length, DNS Setup, and Rotation
Your DKIM key is either helping delivery or quietly breaking it. Here’s the operator guide to 2048-bit keys, DNS splitting, selector rotation, and when TrekMail saves time.
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Alexey Bulygin
SPF Lookup Limit: Fix the 10 DNS Lookup Problem
Your SPF record can be valid and still fail in production. Here’s how the SPF lookup limit works, how to count it, and how to fix it before deliverability drops.
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Alexey Bulygin
Stop Emails Going to Spam: The Fix Order That Works
Most senders fight the spam filter from the wrong end. Here's the fix order that actually works — from broken authentication to complaint rate cliffs — ranked by impact.
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Alexey Bulygin
Emails Going to Spam? Root-Cause Triage Workflow (2026 Fix)
Your emails are going to spam and rewriting subject lines won't fix it. This 15-minute root-cause triage workflow diagnoses authentication failures, reputation damage, and technical hygiene issues—then shows you exactly how to fix each one.
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Alexey Bulygin
Email Reputation vs Deliverability: What's Actually Different
99% delivered but 2% open rates? That's an email reputation problem, not a delivery problem. Here's how to tell them apart and fix the right one.
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Alexey Bulygin
SPF Record Generator: Validate Before You Deploy
Free SPF record generators produce syntactically valid strings — that's not the same as a working record. Here's why they fail and how to audit output in five minutes before it breaks your mail.
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Alexey Bulygin