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.