Mailbox warmup schedule checklist

Print or download this 21-day ramp before attaching cold sequences to a new inbox.

• Day 1-3: 10-15 emails/day to known contacts; verify SPF, DKIM, DMARC pass.
• Day 4-7: 15-25 emails/day; mix plain-text topics; monitor bounces under 2%.
• Day 8-10: 25-40 emails/day; pause ramp if hard bounces spike.
• Day 11-14: 40-60 emails/day; confirm replies land in inbox not spam.
• Day 15-17: 60-80 emails/day; introduce light sequence test on small cohort.
• Day 18-21: 80-100 emails/day if signals stay clean; document mailbox cap.
• Before launch: suppression list loaded; unsubscribe path tested; hourly cap configured.