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Notes on deliverability, warm-up, and email infrastructure.

Field notes from running dedicated SMTP infrastructure — what actually moves inbox placement, and what's just folklore.

The Server Loop

It fixes the timestamp transition bugs, ensures type-safe serialization, and logs precise Firebase index URLs to your console so you can fix database premises.

adminJuly 16, 20264 min read

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Running White-Label SMTP Infrastructure for Clients

Reselling email infrastructure means your clients' sending reputation is downstream of decisions you make. Here's what to get right early on.

January 22, 20261 min read

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Sending Bulk Campaigns Without Tripping Spam Filters

Volume alone does not trigger spam filters, patterns do. Here is what actually gets bulk sends flagged, and what does not, at real sending scale.

January 19, 20261 min read

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Reading Inbox Placement Data Without Guessing

Opens, bounces, and complaints tell you different things. Here is how to tell a deliverability problem from a content problem from a list problem.

January 15, 20261 min read

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Dedicated vs. Shared IPs: When the Switch Pays Off

Shared IPs are not automatically worse than dedicated ones. Here is how to tell which one actually fits your current sending volume and pattern.

January 12, 20261 min read

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Why New IPs Get Throttled, and How Warm-Up Fixes It

A brand-new IP has no sending history, and mailbox providers treat that as a reason for suspicion. Here's what a managed warm-up schedule actually changes.

January 8, 20261 min read

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SPF, DKIM, and DMARC: What Each Record Checks

Three acronyms, three different jobs. Here's what SPF, DKIM, and DMARC each verify, and why mailbox providers want all three before they trust your domain.

January 5, 20261 min read