Why is it important that your ESP integrates with your CRM$?$

Because your delivery rate will not register if an explicit contact is not connected to the open.

Because your segmentation capabilities depend on the amount of information you've gained from your audience.

Because your automation capabilities depend on the amount of information you've gained from your audience.

Because it's important to track contacts that unsubscribed, so you can send them a specified re$-$enagagement campaign.