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 Key Generator: Create, Publish, and Test It Right
Need a DKIM key generator? This guide shows how to create 2048-bit DKIM keys, publish the DNS record, test signatures, and avoid the mistakes that break DMARC.
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Alexey Bulygin
DKIM Setup: Step-by-Step for Custom Domains | TrekMail
DKIM setup fails for the same reasons over and over: wrong signer, wrong host field, truncated keys, and DMARC misalignment. This runbook shows the fix.
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Alexey Bulygin
DMARC Reports: How to Read, Fix, and Enforce
DMARC reports tell you who is sending as your domain, what passes, what fails, and when you can safely move to quarantine or reject.
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Alexey Bulygin
DKIM Fail: Causes, Fixes, and Header Checks
DKIM fail is a cryptographic break, not a warning. This guide shows the exact headers, DNS lookups, and message-path checks to fix it fast.
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Alexey Bulygin
DKIM Record Generator: Safe Setup Guide for 2026
Most DKIM record generator tools hide the risky part: whoever creates the private key can impersonate your domain. Here’s the safe setup path.
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Alexey Bulygin
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