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Practical guides, email hosting insights, and tips to get the most out of your domains and mailboxes.
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Deliverability & DNS
DMARC Record: Setup, Alignment, Reports, and Rollout Guide
A DMARC record tells receiving servers what to do when email fails authentication. This guide covers setup, the three policy levels, alignment mechanics, safe rollout strategy, reporting, and managing DMARC at scale across multiple domains.
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Alexey Bulygin
Deliverability & DNS
Why Emails Go to Spam: Fix Deliverability Beyond DNS (2026)
Perfect authentication scores but emails still land in spam? The real culprits in 2026 are complaint rates, shared IP reputation, provider-specific rules, and infrastructure isolation. Here's what actually fixes deliverability.
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Alexey Bulygin
Deliverability & DNS
Email Authentication SPF DKIM DMARC: Why Green Checks Still Fail
Setting up SPF, DKIM, and DMARC is the entry ticket, not the finish line. This guide covers the real email authentication failure modes — alignment traps, the 10-lookup limit, FCrDNS, one-click unsubscribe requirements, and the 0.3% spam complaint cliff that kills domains.
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Alexey Bulygin
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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