Automated Outbound ROI Calculator

Work backwards from sends. At 15 emails per mailbox per day and 21 working days you get 315 sends per mailbox per month, so 100 mailboxes gets you 31,500 sends. Keep each mailbox under about 20 sends a day and spread them across several domains, roughly two mailboxes per domain, so one burnt domain doesn't take your whole setup with it.

Because sending volume is fixed by your infrastructure, not by your sequence. Every prospect consumes one send per step, so a 2 step sequence over 31,500 sends reaches 15,750 people while a 4 step sequence reaches 7,875. Steps divide, they don't multiply. More steps buys you more touches per person and fewer people touched, and that trade is the whole point of the setting.

3:1 is the usual benchmark. Below 2:1 you're buying revenue at close to what it costs to get, so there's nothing left for delivery or overhead. Above 5:1 usually means you're underinvesting and could spend more to grow faster. Note that the CAC here loads all of month one's cost, including domain setup, onto that month's deals, so it reads conservative on purpose.

Assume nothing lands in month one. Mailbox warmup takes about two weeks before you can send at volume, then a four week sales cycle pushes the first closed revenue into month two at the earliest. So month one is pure cost, which is why the cash flow chart starts with a negative bar. Divide your month one loss by your monthly net from month two onward to see how many months it takes to get back to zero.