TL;DR
Each inbox sends up to 25 emails a day once it has ramped up. A Bundle has 40 inboxes, so it sends about 1,000 emails a day.
New inboxes ramp up first: 1 a day, plus 4 on each weekday they send in a live campaign, 25 a day on the 7th sending day.
The limit is set per inbox, not per campaign. First emails and follow-ups both count toward it, and every campaign using an inbox shares it.
After ramp-up you can change an inbox's limit from its row menu on the Inboxes page. We recommend keeping 25.
On the default Monday to Friday schedule, a Bundle sends about 22,000 emails a month.
When you'd use this
Use this when you want to know how much you can send, why today's sends are lower than you expected, or whether to change a daily limit.
How sending limits work
Per inbox: each inbox has its own daily limit. Once ramped, that's 25 emails a day.
Shared: if several campaigns use the same inbox, they share its 25 a day. To send more, add inboxes (more Bundles), not more campaigns.
Follow-ups count: the limit covers first emails and follow-ups together. ListKit balances new leads and follow-ups for you.
Built in: spacing between emails and sending priority are handled automatically. There are no settings for them.
Rotation: a campaign spreads its sends across all the inboxes you select for it.
Days: campaigns send on the days you pick in Campaign Setup. Monday to Friday is the default and what we recommend.
Each Bundle comes with 20 domains and 2 inboxes per domain (one per sender persona), with SPF, DKIM and DMARC set up for you.
The ramp-up period
Branded inboxes take up to 72 hours to set up, then warm up for 14 days (about 2 to 3 weeks from signup). Pre-warmed inboxes skip warmup. After that, every inbox ramps up: it starts at 1 email a day and adds 4 on each weekday it sends in a live campaign (1, 5, 9, 13, 17, 21, 25), so it reaches 25 a day on its 7th sending day, about 9 calendar days.
Sending day | Daily limit per inbox |
Day 1 | 1 |
Day 2 | 5 |
Day 3 | 9 |
Day 4 | 13 |
Day 5 | 17 |
Day 6 | 21 |
Day 7 | 25 |
Day 8 onward | 25 |
Ramp-up only moves forward on days an inbox sends in a launched campaign. While an inbox ramps, its limit is locked.
How to change a daily limit
Open the Inboxes page from the sidebar (next.listkit.io/email-accounts).
Open the menu on the inbox's row and choose Update Daily Sending Limit.
Enter the new limit and save.
You can only change the limit after ramp-up finishes. Raising it above 25 is one of the most common causes of deliverability problems, so we recommend keeping 25. If you lower an inbox's limit below what it has already sent today, it stops for the rest of the day and sends at the new limit tomorrow.
Restart ramp-up
To send a set of inboxes back to 1 email a day and ramp them up again, select them on the Inboxes page, then choose Restart ramp-up in the bar that appears.
Expected outcome
Once ramped, each inbox sends up to 25 emails a day, and your Bundle sends about 1,000 a day across your campaigns.
FAQ
My daily sends are 12 to 13 out of 25. Why so low?
Usually the inboxes are still ramping up, or several campaigns share the same inboxes. The second number is a ceiling, not a target: sends also depend on how many leads are due today. If it stays low, see Why aren't my cold email campaigns performing, and how do I fix them? or message us.
Should I pause a campaign before starting another one?
No. Campaigns on the same inboxes share those inboxes' daily capacity. You can also choose different inboxes for each campaign.
What's the priority when several campaigns run at once?
ListKit balances sending across them automatically, including follow-ups. There's no priority setting.
Is there a monthly sending cap?
Your daily volume is set by your inboxes. ListKit doesn't stop campaigns for normal sending.
Why can't I change my daily limit?
The inbox is still ramping up. The limit unlocks once it reaches 25 a day.
Can I set different limits on different inboxes?
Yes, the limit is per inbox. We recommend keeping all of them at 25.