Description: This solution discusses why email addresses may need to be reconfirmed in Mailchimp
After processing records through Omatic Cloud you may see a warning that email addresses need to be reconfirmed when sending an email campaign to your audience.
This can happen if a group of audience members that have not been emailed in a while are updated at once and then emailed. This can also happen if a big, new group of email addresses are added to the audience and then emailed. Mailchimp wants to verify that these emails are valid and that the recipients have given permission to email them so that emails are not bounced back. Mailchimp also wants to ensure that they are complying with GDPR and similar laws.
This issue can occur either through an API integration such as Omatic Cloud or using Mailchimp's native import function.
You can find more about this in Mailchimp's Knowledgebase. This reconfirm solution describes how to resolve this issue.