Blog
Deliverability, in plain English.
How cold email actually lands in the inbox — authentication, warmup, reputation, and the APIs that send it. No fluff, no growth-hacking myths.
Why your cold emails go to spam (and how to fix it)
Spam placement is rarely about one bad word. It is authentication, reputation, warmup, and hygiene — in that order. Here is how to diagnose it.
Read →SPF, DKIM, and DMARC: the setup that lands in the inbox
SPF says who can send, DKIM proves nothing was tampered with, DMARC ties them together and tells receivers what to do. Here is the whole picture.
How to send cold email programmatically with an API
You can send transactional email from your app in five minutes — but try cold outbound and you will get banned. Here is the layer built for it.
Cold email via MCP: let your AI agent send outbound
AI agents can write the pitch. The missing piece is letting them send it — safely, through warmed infrastructure. That is what an MCP deliverability server is for.
Email warmup explained: ramping a new sending domain
A new domain has zero reputation. Warmup builds it gradually so receivers learn to trust you — before you send a single real campaign.