The kill switch immediately stops every send in this workspace. Owner or admin turns it on at Settings → General.
Turn on the kill switch
The kill switch is a workspace halt, not a per-sender pause and not a campaign archive.
Sign in as Owner or admin. Members and viewers cannot change this control.
Open Settings → General.
In the Kill switch section, read the line "Immediately halts all sends in this workspace."
Select Activate kill switch and confirm you want to halt automated sends now.
After it saves, the page flashes "Kill switch activated. All sends halted."
Unibox and other send paths then name the reason "Workspace kill switch is ON". Campaigns do not send. A Unibox reply is not handed to LinkedIn. The send is not attempted.
Turn the kill switch off
Resume only when you want this workspace to send again.
Stay on Settings → General as Owner or admin.
Select Resume sends and confirm you want automated sends to resume.
The page flashes that the kill switch is cleared and sends can resume.
If Unibox still blocks a send after you resume, the banner is naming a different Account Protection reason. Open Blocked by Account Protection and fix that row. The kill switch is only one gate.