TL;DR
When you change the sender in a campaign, the change only applies to leads you launch from that moment onward. Any leads that were launched before you updated the sender (even if they are still on Step 1 and haven’t received anything yet because they’re in the sending queue) will be paused. Takes 2 minutes.
Who Should Use This
Team admins reassigning campaigns due to territory changes or team member departures
Sales managers redistributing workload across team members
Agencies transferring campaigns between account managers
Why This Matters
Changing a sender mid-campaign is not just a “display” change. It impacts which leads can keep running. If you don’t understand the launch-time logic, you may accidentally pause a large batch of leads that you expected to continue automatically.
Before You Start: The Only Rule That Matters
Sender assignment is decided at launch time.
Leads launched after you update the sender → will be sent by the new sender
Leads launched before you update the sender (including leads “in queue” waiting to send their first step) → will be paused
This is why a sender change can immediately create two groups: newly launched leads that run normally, and previously launched leads that stop.
Step-by-Step: Change the Sender
Step 1: Open your campaign sequence
Go to Campaigns and select your campaign.
Step 2: Change the email sender
In your campaign, open the Sequence tab, then use the Sender for email steps dropdown to select the new sender. 💡 Important: Only team members with active seats and connected email accounts appear in this list.
Step 3: Change the LinkedIn sender (if applicable)
If your sequence includes LinkedIn steps (for example, Visit profile), click the LinkedIn step in the sequence.
Then, in LinkedIn account used to visit profile (or the equivalent LinkedIn sender field for your step), open the dropdown and select the new LinkedIn sender. 💡 LinkedIn requirement: The new sender must have their LinkedIn account connected to Lemlist.
Step 4: Save your changes
Click Save or Update Campaign (depending on your interface).
✅ Verify: The sender fields should now display the new team member’s name.
What Happens Next (Clear Logic)
After you update the sender, your campaign will behave like this:
Group 1 — Leads launched after the change
These leads will run normally
They will be contacted by the new sender
Group 2 — Leads launched before the change (including “queued” leads)
These leads will be paused
This includes leads that are still on Step 1 and haven’t received anything yet (because they were launched earlier and are waiting in the queue)
Important: The “paused” outcome is based on when the lead was launched, not based on whether they already received an email.
How to Identify the Impact in Your Campaign
Step 5: Use the Sequence view to understand where leads are sitting
In your campaign Sequence, select the step you want to review, then look at the to come indicator to understand how many leads have not reached that step yet (i.e., are still earlier in the sequence).
Next, use the people counter on the step to see how many leads are currently on that step (i.e., already in progress at that stage of the sequence).
💡 Tip: If you changed the sender and suddenly see many leads with active status, but receiving nothing (including leads that never received Step 1), that’s expected. Those leads were launched before the sender update.
Practical Application / Real-Life Example
Sender change mid-campaign:
You have 500 leads already launched on Monday morning. Some are already contacted, and some are still waiting in the queue to receive Step 1.
On Tuesday, you change the sender from Sarah to Mark in the Sequence settings.
What happens:
All leads launched on Monday (even those still waiting for Step 1) → become paused
Any leads you launch from Tuesday onward → will run using Mark as sender
What to do next:
If you want those paused Monday leads to continue, you must take action (see Troubleshooting below).
Troubleshooting
Issue: New sender doesn’t appear in the dropdown
Root cause: New sender doesn’t have an active seat or hasn’t connected their email/LinkedIn account
Fix:
Go to Settings → Team → Verify new sender has an active seat
New sender must connect their email: Settings → Email Accounts
For LinkedIn steps: Settings → Integrations → LinkedIn
Refresh the campaign page after connecting accounts
Issue: Leads are paused after changing the sender (including leads that never received Step 1)
Root cause: Those leads were launched before the sender change. Sender changes only apply to leads launched after the update. Previously launched leads are paused, even if they were still in the queue.
Fix:
Option 1: Select the original sender of the campaign
Option 2: Reach out to lemlist support if you need help reassigning leads to the new sender
Issue: All leads stopped receiving emails after the sender change
Root cause: You changed the sender, so the leads launched earlier got paused, and the new sender may not have any newly launched leads yet (or their email account isn’t properly connected).
Fix:
Launch a new batch of leads after the sender update to confirm the new sender is working
Check new sender’s email connection: Settings → Email Accounts
Verify email shows "Connected" status, not "Error" or "Disconnected"
Select the original sender of the campaign
Reach out to lemlist support if you need help reassigning leads to the new sender
Issue: Can’t tell which leads will use which sender
Root cause: The rule is launch-time based, not “current step” based.
Fix:
Identify when the sender change happened, then segment leads by whether they were launched before or after that moment
Export campaign reports for further analysis
Recommended Migration Strategies
Strategy 1: Change the sender first, then launch
When to use: You haven’t launched leads yet (or you can afford to wait)
Steps:
Update the sender in the Sequence
Launch your leads
Result: Everyone launched after the change runs under the correct sender.
Strategy 2: If leads were already launched, plan for a relaunch
When to use: The campaign was already launched, and you must switchthe sender now
Steps:
Change the sender in the sequence.
Identify the leads that became paused (launched before the change)
Export and relaunch them under the new sender (often via a duplicate/new campaign)
Result: Previously launched leads don’t automatically transfer; you deliberately move/relaunch them under the new sender.
Tips for Optimization
Change sender before launching whenever possible - This avoids generating a paused batch of leads.
Time sender updates between launches - If you launch leads daily, update the sender right before the next day’s launch so the split is clean.
Audit “queued” leads after sender change - Leads that never received Step 1 can still be paused if they were launched earlier.
Test the new sender setup - Confirm the new sender’s email/LinkedIn is connected before launching the next batch.