Sending · 10 min · reviewed 2026-09-24
How do I set daily sending limits per mailbox and per domain?
Set each mailbox's cap under Settings → Senders and each domain's cap under Settings → Sending domains. SalesCrew never sends past either one. A new mailbox starts at 30 sends a day until you change it.
What you will need
- The admin role in SalesCrew.
- Mailboxes in the sending pool. Connect them under Settings → Mailboxes first.
- SPF, DKIM and DMARC set on each sending domain.
Steps
- 1
Step 1
In SalesCrew, open Settings → Senders. Each row is one mailbox, with its Warmup, Health and Cap.
- 2
Step 2
Click a mailbox's Cap and type its daily limit. Keep a new or cold mailbox low, then raise it week by week.
- 3
Step 3
Open Settings → Sending domains. Set each domain's Cap. That's the total for every mailbox on that domain in one day.
- 4
Step 4
Warming a fresh domain? Give it a ramp cap below its full cap, and raise it as the domain warms up.
- 5
Step 5
Open Settings → Deployment → Sending and pick the Sender rotation. FIFO sends from the mailbox that sent least recently. Least loaded picks the one with the fewest sends today. Leave Only warm senders on while mailboxes warm up.
- 6
Step 6
From Claude or ChatGPT, the same settings work over MCP. Use pool_sender_set with daily_cap for a mailbox and pool_domain_set for a domain.
- 7
Step 7
Before a big launch, ask your assistant to run pool_senders. It lists sends today, what's left and which mailboxes are at their cap.
Common errors
- Sends stop early in the day
- every mailbox hit its cap, or the domain did first. Raise the tighter cap, or add a mailbox.
- One mailbox does all the work
- the others are paused or unhealthy. Check Health on Settings → Senders.
- A mailbox is never picked
- it's disabled in the pool, or its domain is paused. Turn it back on with pool_sender_set.
How you know it worked
Settings → Senders shows the cap you set on each row. After a send, pool_senders shows sent today rising toward that cap.
Where this goes in SalesCrew
Settings → Senders shows each mailbox's Cap, and pool_senders shows sent today against it. In your own workspace the same how-to opens beside the field, with your callback URLs filled in.