This article will give you a better understanding of what happens when you pause a campaign or stop a workflow containing active subscribers.
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To pause a campaign, navigate the Campaigns tab and use the drop-down to the far right of the campaign name to switch it from Active to Paused.
It can take up to 5 hours for a paused campaign to take effect and you should allow for that much time when planning to pause a campaign. When that's the case, emails that are scheduled in that window of time are not impacted by the campaign being paused and those email will still send per their delivery timing. Paused campaigns will not accept any new subscriptions.
When you reactivate the campaign, allow up to 5 hours for the change to take place. This means that the campaign may take up to that long to resume email sends to subscribers of the campaign. Once resumed, subscribers will pick back up where they left off before the campaign was paused.
To prevent individual campaign emails from sending without the need to pause the entire campaign, switch those emails from Published to Draft.
Pausing Campaigns in Workflows
If your campaigns are sent via steps in your workflows, pausing the campaign will simply prevent any further emails from getting sent until it is reactivated. As every workflow is different, it is hard to say whether abruptly pausing a campaign will have any effect on further steps in the workflow.
Note: Best practice for pausing campaigns in workflows is to review every campaign on a case-by-case basis. Check for decisions or goals in the workflow that could be impacted by pausing each campaign.
If you have a need to halt one of your workflows, simply stop the workflow from accepting new subscribers by clicking the Stop Workflow button.
When an active workflow with subscribers is abruptly stopped, no new subscribers will be able to enter the workflow until it is resumed by clicking the Start button. However, subscribers that were already active in the workflow before it was stopped will remain active in the workflow. This means that those subscribers can still receive campaign emails and trigger goals.
Pausing a campaign is not best practice if you want to completely remove subscribers from a particular campaign. Yes, it will prevent any further emails from getting sent, but if you reactivate it in the future, those subscribers will still be subscribed to the campaign and pick up right where they left off when the campaign was originally paused. If you need to completely remove subscribers from a campaign, you should run a bulk operation with the Remove from a campaign action for the segment of subscribers you wish to remove.