$ man rotation-logic

Rotation Logic

The system for cycling sending mailboxes in and out of active campaigns. Some mailboxes send, some rest, some warm. Rotation prevents any single mailbox from being overused and distributes reputation risk across the infrastructure.

Even with per-inbox limits, mailboxes degrade over time. Consistent cold email volume, even at safe limits, slowly erodes reputation. Rotation counteracts this by giving mailboxes rest periods. A mailbox that sends for 4 weeks and rests for 2 recovers reputation. A mailbox that sends continuously for 12 weeks burns out. Rotation is the difference between infrastructure that lasts months and infrastructure you rebuild every quarter.

I rotate on a 4-week cycle. A mailbox sends for 4 weeks, then rests for 1-2 weeks while its backup takes over. During rest, the mailbox still warms (low-volume, engagement-based emails in Instantly's warming pool) to maintain baseline reputation. I track rotation schedules in a spreadsheet — which mailboxes are active, which are resting, when the next swap happens. It's manual but critical. Automated rotation is on my roadmap.