Illingworth puts a lifespan cost on every extra daily send
His fix when a campaign needs more volume is more inboxes, not a higher daily number.
Richard Illingworth has attached a rough lifespan to each sending tier per inbox. His ceiling is 15 to 20 emails a day, which he calls the balance between how long an inbox lasts and how much it can send. Let it drift to 30 a day and he says the inbox might give you 6 months instead of 9. Push to 40 or 50 and he says it could be done for in six weeks.
The framing comes out of Alex Hormozi's rule of 100, which Illingworth describes as reaching out to 100 or more new people a day and not judging any of it until you have done that for 100 days straight. His point is that the math only holds if the infrastructure survives the full run. As he puts it, push the inboxes too hard and they will be toast on day 30.
The trade he is pricing
The 30 a day tier is the interesting one because it still clears the 100 day mark. Illingworth's objection is not that it fails, it is what it costs to get there. Going from 20 to 30 buys you ten extra emails a day and, on his numbers, spends roughly a third of the inbox's remaining life to do it.
His rule when a campaign needs more volume is to add inboxes and leave the daily number alone. That is consistent with how he has described earlier that inbox lifespan responds to how you run the asset rather than how many you buy.
How much weight to give it
These are estimates, not a published test. Illingworth does not say how many inboxes or how many sends the 9 month, 6 month and six week figures are drawn from, and he closes the post by pointing readers at Premium Inboxes, the service he says he built to handle all of this. He sells the thing the advice makes you buy more of, so treat the month figures as a rule of thumb from someone with a position rather than a measurement.
For people sending, the practical read is the shape of the curve rather than the exact months. The cost of raising daily volume is not linear, it lands on the asset you cannot quickly replace, and the damage shows up weeks after the decision that caused it. If you are running at 30 or above per inbox right now, the question is whether the extra sends are worth retiring that inbox earlier than planned.
you've given up a third of its life for 10 extra emails a day
push them too hard and they WILL be toast on day 30.
Know what is landing before you burn another domain
One email a day. Under three minutes. What the operators found out yesterday.