Before you send a campaign, we highly recommend that you do two things:
1) Clean hard bounces (bad emails) off your list. You can use Neverbounce for this!
2) Import a Do Not Mail list.
To import a Do Not Mail list, first create a CSV file of the contacts you want to add to your Unsubscribed folder. Then, click on Contacts > Import Contacts and choose Import a Do Not Mail list:
If you use our system to import your lists from Mailchimp, your opt outs and hard bounces will automatically port over as Do Not Mail into your Unsubscribed folder.
Once you’ve imported these contacts, you will find them in your Unsubscribed folder with a status of Do Not Mail.