Cold email for YC founders — the in-batch playbook.
You have 8-10 weeks left in batch and a half-validated ICP. Cold email is the cheapest way to test which version of your ICP actually converts. Done wrong, it burns your founder domain.
Most batch founders try to send from their founder@company.com. Two weeks in, that address starts going to spam. By demo day, the domain reputation is too low to recover before the post-batch fundraise. The fix is an isolated sending estate provisioned in the first 14 days of batch — separate domain, warmed mailboxes, full authentication, and a copy framework that survives ICP iteration.
What changes for this use case.
- ·Batch founders run multi-ICP tests in parallel — not just one segment. The sending estate has to support that.
- ·21-28 day domain warmup means starting infrastructure the week you arrive, not the week you decide to send.
- ·YC's Bookface and batch Slack give a parallel warm-intro channel — the cold layer is for ICPs you can't reach there.
From the knowledge base.
The chapters that map to this use case, in suggested reading order.
The pre-seed reading path — standing up outbound from zero
Ten chapters in sequence. Read this first, in order.
Closed-won deconstruction — finding the first hypothesis
Even three friendly logos generate ICP signal. Surface the attributes before you write any copy.
Cold email — the complete setup reference
14 chapters. Skim once, then deep-read SPF / DKIM / DMARC, subdomain architecture, and warmup.
Subdomain isolation — the reputation firewall
Why the corporate domain (company.com) and the sending domain (companyalt.com) must be separate. The single most damaging mistake batch founders make.
Inbox warmup, demystified
Why volume-based warmup is now detectable. The engagement-curve model that survives.
What makes cold copy good — the four principles
Read before you send the first sequence, not after underperformance.
We provision the full sending estate during your batch.
Domains, authentication, warmup, sequencing, reply routing. Operated by an engineer in your Slack. Most batch founders are sending into primary inboxes within 21 days.