Deliverability & DNS
SPF, DKIM, DMARC setup guides, DNS record configuration, inbox placement troubleshooting, and deliverability monitoring for self-hosted email.
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DMARC Setup: Publish, Test, and Enforce Correctly
DMARC setup is simple until SPF, DKIM, forwarding, and third-party senders collide. This guide shows the record to publish, the tags that matter, and how to enforce safely.
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Alexey Bulygin
DMARC Analyzer: Read Reports and Fix Failures Fast
Most DMARC failures are not what they look like. This guide shows how to use a DMARC analyzer to separate spoofing, forwarding, and real DNS mistakes.
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Alexey Bulygin
Email Authentication SPF DKIM DMARC Setup Order
SPF first. DKIM second. DMARC last. This guide shows the safest way to set up email authentication without breaking legitimate mail flow.
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Alexey Bulygin
DMARC Record Example: 5 Policies That Actually Work
A practical DMARC record example guide with working TXT records, rollout steps, common failure points, and the TrekMail setup choices that affect alignment.
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Alexey Bulygin
Create DMARC Record: DNS Setup, Policy, and Mistakes
Create DMARC record the right way: exact DNS host, sample TXT values, policy rollout, alignment traps, and the mistakes that quietly break mail.
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Alexey Bulygin
Emails Going to Spam: Fix Deliverability Fast in 2026
When emails start landing in spam, don’t rewrite subject lines first. Check headers, DNS, alignment, and reputation. This playbook shows the order that actually fixes it.
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Alexey Bulygin
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
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
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
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
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
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