How do tools handle inbox rotation and sending limits?

Inbox rotation and sending limits are core features of cold email tools.

Inbox rotation:

Tools connect multiple mailboxes to a single campaign

Sends are distributed across connected accounts

Each recipient gets mail from one specific mailbox (for threading)

Rotation can be round-robin, weighted, or random

Sending limit management:

Per-mailbox daily limits (configurable)

Per-hour or per-minute throttling

Automatic spacing between sends

Business hours scheduling

Why rotation matters:

Distributes reputation risk across accounts

Enables higher total volume than single account

If one account has problems, others continue

Matches individual sending patterns

Configuration best practices:

Set conservative per-mailbox limits (50 to 100 daily)

Enable random delays between sends

Configure business hours appropriate to recipients

Monitor each mailbox's health individually

Common issues:

Over-aggressive rotation burns accounts faster

Poor limit settings trigger rate limiting

Uneven distribution overloads some accounts

Rotation without monitoring hides problems