The first message that goes out is a request to connect on LinkedIn. If the recipient accepts your request, they could receive up to three more messages automatically. If they don’t respond after the last message, the campaign ends for that person.
If the recipient does not accept your initial request to connect, they will not receive any more messages.
However, if at any time during the campaign the recipient responds to one of the messages, you would reply directly to them and the automation would end.