Contacts

How to send a campaign only to those contacts who have not received a previous campaign
Sometimes you may need to send a campaign only to those contacts to whom you did not send a previous campaign. To do this, you will need to create a segment (or filter) that includes the subscribers who did not...

Why do my subscribers receive duplicate copies of my campaigns?
When you send a campaign, only one email is sent to each subscriber. However, it could be that one of your subscribers receives one of your campaigns more than once. This can be due to different reasons, which are detailed...