Deliverability & DNS
SPF, DKIM, DMARC setup guides, DNS record configuration, inbox placement troubleshooting, and deliverability monitoring for self-hosted email.
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Email Bounce Rate: Safe Thresholds and How to Fix It
Most bounce problems aren't just a list issue — they're an infrastructure emergency. This guide breaks down every SMTP bounce code, the thresholds that trigger ISP penalties, and the exact triage order to stop deliverability damage before it spreads.
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Alexey Bulygin
SPF Record Example: Copy-Paste Templates for Every Setup
Copy-paste SPF record examples for common setups: single provider, hybrid stacks, and forwarding. Covers lookup limits, flattening risks, and verification commands.
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Alexey Bulygin
SPF Setup for Multiple Senders: Beat the 10-Lookup Limit
SPF has a hard 10-lookup ceiling and most multi-sender domains blow past it silently. Here's the subdomain segmentation pattern that gives each sending stream its own budget — so your SPF setup survives vendor changes without rewrites.
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Alexey Bulygin
Email Deliverability Best Practices That Actually Work
Your server can say sent while the inbox says no. These email deliverability best practices focus on authentication, reputation, forwarding, and the operational mistakes that actually tank placement.
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Alexey Bulygin
Email Sender Reputation Score: What It Measures, How to Fix It
Google, Microsoft, and Yahoo each maintain separate reputation verdicts for your domain. Here's what they actually measure, where the hard limits are, and a 14-day recovery plan for when your email sender reputation score crashes.
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Alexey Bulygin
DMARC RUF: When to Use It and When to Skip It
DMARC RUF sounds useful until it floods your inbox or gives you nothing from the providers that matter. Here’s when to use it, when to skip it, and what to configure instead.
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Alexey Bulygin
Why Emails Go to Spam: Real Causes & Fixes | TrekMail
SPF passes. DKIM passes. DMARC is set. And yet you're in spam. Here's why emails go to spam even with perfect authentication — and the structural fixes that actually work.
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Alexey Bulygin
Domain Reputation: How It Breaks and How to Fix It (2026)
Domain reputation breaks faster than it builds. This guide covers the 0.3% spam complaint cliff, SPF/DKIM/DMARC alignment traps, the Yahoo inbox-denominator death spiral, Google's high-water mark rule, and the step-by-step recovery plan to pay down reputation debt.
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Alexey Bulygin
SPF Record Setup: Examples, Generators & Common Failures
A broken SPF record means SMTP 550 rejections, not just spam folder placement. This guide covers single-domain setup, agency multi-sender patterns, the 10-lookup limit, flattening vs. segmentation, and the failure modes that cause 80% of deliverability tickets.
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Alexey Bulygin
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
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
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