Hello,
Thank you for reaching out to Constant Contact API Developer Support.
Autoresponder email campaigns are triggered by when a contact is newly added to the list associated with the Autoresponder. This happens outside of the API, so there is no way to prevent them from being sent an Autoresponder campaign if they are added to the appropriate list(s).
Can you share a bit more about your use case? I may have a possible workaround option for you.
Please let us know if you have any other questions!
Regards,
David B. Tier II API Support Engineer
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