Following up with people who have not opened your message after several days is good practice to maximize the reach of a campaign without over-soliciting your contacts.
These follow-ups make it possible to generate new opens and new clicks from contacts who may simply have missed the first send. We recommend that, at the time of the follow-up, you slightly modify the subject line and/or the sending time to test what works best: sometimes a simple change in wording or sending at another time of day can make all the difference.
This approach increases the overall open rate of the campaign while respecting good deliverability practices, provided that follow-ups are not multiplied abusively. We advise waiting at least 48 hours before sending a follow-up, so that your recipients do not feel over-solicited by your communications.
To send a follow-up, you can go to the Statistics section of “Campaigns”.
Click on the three dots at the top right of your screen to access the “follow up on a campaign” option. You can choose to follow up on an Email or SMS campaign depending on the initial campaign.
You can choose to send a second communication to:
openers
clickers
active contacts: those who have opened and clicked in your message
inactive contacts: those who have not opened your message

You can then choose to keep the content of the first campaign.
You will be able to modify the subject line and the content of the message if you wish, and you can send your follow-up to the targeted recipients.