Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions
about building into Constant Contact's API.
It looks like we've already followed up with you directly via email, but here is the information provided for visibility on the forum:
The campaign will pull contacts from the list(s) at the time of send. If you were to schedule your email for later, but made changes to your list(s) between when you scheduled the email and when the email was actually sent, it would send to the current list members, reflecting any changes made up until that point.
... View more
