TrekMail Blog
Practical guides, email hosting insights, and tips to get the most out of your domains and mailboxes.
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Email Migration
IMAP Migration Tool: What to Look For in 2026
Most email migrations fail on resume logic, throttling, and bad logs. Here’s how to judge an imap migration tool before it burns your cutover window.
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Alexey Bulygin
Email Migration
How to Migrate Email: Step-by-Step Plan for Zero Downtime (2026)
A rigid, phase-by-phase plan to migrate email for small businesses. Covers the forensic audit, DNS TTL prep, pre-stage IMAP sync, cutover execution, SPF/DKIM setup, and post-migration verification with item counts.
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Alexey Bulygin
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
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
Deliverability & DNS
DKIM Record: Setup, Selectors, Key Rotation, and Failure Debugging
A DKIM record publishes a public cryptographic key that proves your email wasn't tampered with in transit. This guide covers setup, selectors, the 255-character DNS problem, key rotation, failure troubleshooting, and CNAME-based automation at scale.
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Alexey Bulygin
Deliverability & DNS
Email Deliverability: Authentication, Reputation, and Fixes (2026)
Email deliverability is an infrastructure problem. This guide covers the authentication stack (SPF, DKIM, DMARC), reputation economics, provider-specific intelligence for Gmail/Outlook/Yahoo, and a 24-hour triage plan to get out of the spam folder.
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Alexey Bulygin
Deliverability & DNS
SPF Lookup Limit: Fix the 10 DNS Lookup Problem
The SPF lookup limit quietly breaks growing email stacks. Here’s how to diagnose it, avoid bad fixes, and rebuild SPF so mail keeps working.
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Alexey Bulygin
Deliverability & DNS
How to Set Up DMARC Without Breaking Email
How to set up DMARC without killing legitimate mail: start in monitor mode, fix alignment, then tighten policy to quarantine and reject.
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Alexey Bulygin
Deliverability & DNS
DMARC Fail: Fix Alignment, Forwarding, and SPF
Seeing dmarc=fail in reports or headers? This guide shows how to trace alignment, forwarding, DKIM, and SPF issues without wasting hours in DNS.
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Alexey Bulygin
Deliverability & DNS
DMARC RUA: Setup, Reports, and Fixes
DMARC RUA is the reporting address that makes DMARC useful. Here’s how to publish it, read the reports, and fix the failures that hurt deliverability.
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Alexey Bulygin