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Deliverability & DNS
DMARC Reject Policy: When to Enforce and What to Check
A DMARC reject policy stops spoofing, but flipping it too early can block your own mail. Here’s the checklist, rollout path, and failure patterns that matter.
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Alexey Bulygin
Deliverability & DNS
Email Authentication SPF DKIM DMARC Explained
SPF, DKIM, and DMARC do different jobs. This guide explains what each one does, where setups fail, and how to publish the right DNS without breaking mail.
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Alexey Bulygin
Deliverability & DNS
DMARC Report vs DMARC: Record and XML Explained
A DMARC report is not your DMARC record. It’s the feedback loop that shows who’s sending mail with your domain, what passed, what failed, and what to fix.
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Alexey Bulygin
Deliverability & DNS
How to Set Up DKIM: Step-by-Step DNS Guide (2026)
Step-by-step guide to setting up DKIM authentication. Covers key generation, DNS record configuration, verification commands, DMARC alignment, and common mistakes to avoid.
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Alexey Bulygin
Deliverability & DNS
DKIM Selector: Setup, Lookup, and Troubleshooting
A dkim selector is the lookup label that tells receivers which DKIM key to fetch from DNS. Here’s how it works, how to test it, and how to fix failures fast.
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Alexey Bulygin
Deliverability & DNS
SPF Too Many DNS Lookups: Fix the 10-Lookup PermError
SPF too many DNS lookups isn’t a warning. It can trigger PermError and break mail authentication. Here’s how to audit the chain and fix it without losing coverage.
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Alexey Bulygin
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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