Deliverability & DNS
SPF, DKIM, DMARC setup guides, DNS record configuration, inbox placement troubleshooting, and deliverability monitoring for self-hosted email.
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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
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
Emails Going to Spam? Root-Cause Triage Workflow (2026 Fix)
Your emails are going to spam and rewriting subject lines won't fix it. This 15-minute root-cause triage workflow diagnoses authentication failures, reputation damage, and technical hygiene issues—then shows you exactly how to fix each one.
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Alexey Bulygin
Email Reputation vs Deliverability: What's Actually Different
99% delivered but 2% open rates? That's an email reputation problem, not a delivery problem. Here's how to tell them apart and fix the right one.
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Alexey Bulygin
SPF Record Generator: Validate Before You Deploy
Free SPF record generators produce syntactically valid strings — that's not the same as a working record. Here's why they fail and how to audit output in five minutes before it breaks your mail.
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Alexey Bulygin
SPF Fail: Decode the Error and Fix It Fast
Your email bounced with 550 5.7.1 or 5.7.26 and a client is waiting. An SPF fail is a DNS authentication failure, not a content problem. This guide decodes the error, finds the failing IP in your headers, and walks through the three fixes that resolve most cases.
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Alexey Bulygin
Improve Email Deliverability: 30-Minute Checklist
Your mail can get a 250 OK and still vanish. This 30-minute checklist shows how to improve email deliverability by fixing SPF, DKIM, DMARC, reverse DNS, and complaint rate before you waste time on the wrong thing.
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Alexey Bulygin
Email Deliverability Monitoring: The 15-Minute Routine
Your SMTP server says 250 OK. Your client never saw the email. That silence is what makes email deliverability monitoring critical — and neglected. Here's the free-tool routine that catches failures before they torch your domain.
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Alexey Bulygin
Email List Verification: How to Clean Your List Before It Kills Your Deliverability
Bad email addresses destroy sender reputation silently. Every bounce, spam trap hit, and invalid address chips away at your domain score until real messages start landing in spam. Here is how email list verification works, what it actually checks, and how to clean your list before your next send.
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Alexey Bulygin
Create SPF Record Without Hitting the 10-Lookup Limit
Most SPF guides tell you what to paste. This one shows how to build an SPF layout that survives vendor sprawl, lookup limits, and future DNS changes.
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Alexey Bulygin
How TrekMail Protects Your Inbox
Your TrekMail inbox is protected by automatic spam filtering, phishing detection, and attachment scanning — all running locally on our servers. Here is what that means for you.
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Alexey Bulygin
SPF Record Setup: Step-by-Step Guide With Provider Examples
SPF isn't optional. Since February 2024, Google and Yahoo reject mail from domains without it. This guide covers the complete SPF record setup — syntax, provider configs, DNS publishing, and CLI validation — so you get it right the first time.
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Alexey Bulygin