Email warmup schedule calculator

5 mailboxes reach 100 warmup emails a day in 20 sending days, at 20 emails per mailbox. At this mode's ceiling of 40 emails per mailbox, that target fits on 3 mailboxes. That figure is for 5 mailboxes aiming at 100 warmup emails a day on a new domain, on the normal ramp. Change the inputs on this page to use your own numbers. No account required.

WarmySender runs outreach on autopilot with AI agents across cold email, email warmup, LinkedIn, Instagram and multichannel sequences, plus real-time email verification. Every mailbox stays inside these ceilings whether a person or an agent set the campaign up. This calculator only does the arithmetic — it never sends, and it never raises a limit.

Week by week for the example

Volume steps up every two sending days. "Day" means a day the mailbox actually sent.

WeekSending dayPer mailboxAll mailboxes
Week 1Day 7735
Week 2Day 141575
Week 3Day 2020100

How the days are counted

Common questions

How many days does email warmup take to hit a daily target?

5 mailboxes reach 100 warmup emails a day in 20 sending days, at 20 emails per mailbox. At this mode's ceiling of 40 emails per mailbox, that target fits on 3 mailboxes.

Do calendar days count, or only days the mailbox sends?

Only sending days. A mailbox that cannot connect stays where it is until the first warmup email actually goes out, then continues from that point.

Can I raise the ceiling to finish sooner?

No. Each warmup mode has a ceiling, and this calculator will not suggest a way around it. If the target does not fit, add mailboxes. The faster ramp still stops at the same ceiling.