Cold email infrastructure, deliverability tactics, and warm-up benchmarks from the team building SendChief.
The four email authentication standards, what each one actually does, how they compose, and why DANE is the one most cold-email providers quietly skip. A deliverability engineer's walkthrough.
Per-mailbox pricing destroys outbound margins at scale. Here is the math on Google Workspace vs Microsoft 365 vs dedicated VPS for a 50-mailbox cold email operation — and why flat-rate infrastructure wins past ~20 mailboxes.
Deliverability is 80% infrastructure and 20% content. Beautiful copy on a bad IP does not reach the inbox. Here is what actually drives placement, in the order it matters.
An honest side-by-side of the six cold email infrastructure providers operators actually consider in 2026. We look at what each one actually delivers — dedicated vs shared, IP control, DNS access, exports — not the marketing copy.
The step-by-step version of a cold email infrastructure build in 2026: domains, DNS, IP warm-up, monitoring. Written for operators who want to stop guessing about deliverability.
Shared mailboxes look identical to dedicated ones until the moment they don't. Here is the concrete technical gap between owning a VPS with your own mail server and renting a seat on someone else's infrastructure — and why that gap decides your deliverability.