Calculator · Agency
Plan the full infrastructure needed to run cold email across all your agency clients — with backup built in.
Your agency setup
Total sends / month
15,000
5 clients × 1,000 leads × 3 touches
Active inboxes
46
15 sends/day each
Total with backup
58
+25% reserve
Domains needed
20
max 3 inboxes each
Inboxes per client
10
average
Domains per client
4
isolated pool
Monthly infra cost estimate
Conservative ($6/inbox)
$348/mo
High-end ($15/inbox)
$870/mo
Agency rule: Never put two clients on the same domain. One client's spam complaints burn everyone else. For pre-warmed inboxes deployable same-day, WarmInboxes has GWS and M365 options ready to go.