Campaigns are a series of messages that are sent to a tag group. ELMessenger Pro will remember where each contact is in the campaign as long as they remain in the tag group.
Example:
Person A
Person B
Person C
Message 1
Message 2
Message 3
Day 1
Day 2
Day 3
Day 1 Person A is added to your tag, and you run the campaign. They will receive messages 1
Day 2 Person B is added to your tag, and you run the campaign Person A will receive message 2, and Person B will receive message 1