Domain ramp and caps
Two inboxes on one domain share its number. They do not each get it.
Other senders cap the inbox. Receivers judge the domain. CraftNudge enforces the cap and the ramp at the domain, over every inbox that sits on it.
Per inbox, still
Each inbox keeps its own daily cap, its own ramp from a starting number up by a step a day, and a minimum gap between sends with random jitter. That is the floor, not the whole story.
A daily cap per domain
Set one number for a domain and every inbox on it shares it. Adding a mailbox never adds volume to a domain that is still earning trust. If two inboxes disagree on the number, the lower one wins.
Counted over the whole domain
The count includes inboxes a campaign does not use and inboxes since deactivated, so a fleet change cannot hand the allowance back. An inbox that has sent today cannot be deleted. Pause it instead.
The warmup ramp
A schedule of daily numbers, week by week: 5, 10, 12, 15, 20, 25 by default, and the last number holds from then on. Start it per domain from the settings page.
Moving up a week
Once a week a domain moves to the next number, unless it bounced too much. Under ten sends, any bounce holds it. Over ten, the bounce rate has to be under your limit, 5% by default. The reason it was held is shown next to the domain.
Shared out, then enforced
The page shows the week’s number split across the active inboxes on the domain, 12 as 6 and 6. What is enforced is the domain’s number, so a quiet inbox cannot lock up the rest.
Tests count too
A test send to yourself and an inbox placement test come out of the same day’s numbers, at both levels. Nothing goes out of a domain that has spent its day.
Seen against the line
The deliverability page draws each domain’s last fourteen days as a bar per day against what it was allowed that day. A bar over the line is a day the ramp was broken, which is the thing worth seeing at a glance.