What Happens When Two Imports with Segments are Running?

If you have more than one import wizard with our segment option enabled, they might run simultaneously and conflict. To mitigate this, the system checks if another segment job is already running on the same subscriber list before starting another import job with segments. If another job is found, the new job will wait until the current one finishes. This prevents any conflicts or data issues. The new job will start when the schedule next runs.

If you have multiple imports on the same lists using the segment feature, a good option is to space the schedule apart. You can choose a custom schedule using the wizard itself.

From a technical perspective, if you have a lot of imports on the same list using the segment option, a job that is delayed will get priority the next time the schedule runs.

If you prefer, you can avoid the above by not using the segment setting in the import wizard at all. Instead, map the Salesforce fields that define the segment to your Campaign Monitor custom fields. Then set up the segmentation rules in Campaign Monitor with those custom fields. https://help.campaignmonitor.com/s/article/list-segmentation