By the end of this tutorial, you'll know how to set up inbox rotation across multiple sending accounts, distribute leads across your team, and keep a consistent sender for each lead throughout the sequence.

Inbox rotation lets you send higher volumes of cold emails while respecting the daily sending limit for each inbox. By distributing sending across multiple accounts, you avoid overloading a single sender. Additionally, lemlist employs round-robin distribution and scheduling mechanisms to ensure fair and efficient email sending.

Before you start, make sure you have:

Step 1: Open your campaign

Go to Campaigns, then select the campaign you want to edit.

Step 2: Select multiple senders for the campaign

In your campaign’s Sequence, click the Sender assignment dropdown, then select the email accounts you want to include in the rotation.

Step 3: Confirm inbox rotation is enabled

After selecting more than one sender, the sender field will display Multiple senders. This means lemlist will rotate senders for new leads added to this campaign.

Here’s how lemlist assigns leads when you use multiple senders:

For Step 1: lemlist distributes new leads across the selected senders.

For Steps 2, 3, and beyond: Each lead keeps the same sender that was assigned at the beginning of the sequence, so the conversation stays consistent.

✅ Key principle: Unless you override it on a step, each lead keeps a one-to-one relationship with their assigned sender throughout the entire sequence.

Step 4: Override the sender for a specific step

Click the step you want to customize, enable Override for this step, open the sender dropdown, and select the sender you want to use for that specific step.

💡 Use case: Have a specific person send a key follow-up (e.g., a manager sending a final email), while keeping the rest of the sequence on rotation.

Step 5: Check for sender problems

If a sender can’t be used (for example, the mailbox is disconnected, authentication failed, or sending limits are reached), update that mailbox before launching or continuing sending.

Common causes include:

Step 6: Resolve sender issues

Fix issues by:

Agency scenario: An agency wants to send about 300 cold emails a day for one client.

At 30/day per mailbox through lemlist, that needs roughly 10 warmed mailboxes. Because the ceiling is per provider, those mailboxes should be spread across providers and warmed domains rather than stacked as ten Google mailboxes on one domain.

Without inbox rotation: 10 separate campaigns, one per inbox, creating management overhead

With inbox rotation: 1 campaign with 10 senders in rotation

💡 Plan the ramp, not just the rotation. Every mailbox you add needs its own ~40 days of warm-up plus 14 days of stabilization before it can join the rotation. Capacity is something you build weeks ahead, not something you switch on.

Task management: When leads reply or require follow-up, tasks route to the sender who contacted that lead. Check teammates’ task lists to see assignments based on sender responsibility.

Issue: A sender can’t be used

Root cause: Email account disconnected, sending limits exceeded, or authentication expired

Fix:

Issue: Leads receive emails from different senders in the sequence

Root cause: Override for this step was enabled on one or more steps

Fix:

Issue: Uneven distribution across senders

Root cause: Some senders were added after the campaign started, or leads were manually assigned

Fix:

Issue: Deliverability dropped after adding more senders to the rotation

Root cause: The added mailboxes are on a provider that is already carrying the volume, or they were added before finishing warm-up. Rotation spread the sending, but the provider-side reputation budget did not grow.

Fix:

Issue: Tasks appear in teammates’ lists unexpectedly

Root cause: Tasks are assigned to the sender who contacted each lead

Fix:

To maximize inbox rotation effectiveness: