Good Afternoon @RowenaI
Thanks for joining us in the Community. That is a great question. If a contact is on multiple lists and you send the same campaign to those different lists at the same time, the contacts will only receive one copy of that email. If you are attempting to send the same email campaign at different times to multiple lists the contact would get this multiple times. As a result, it's recommended to select multiple lists in your original send so the contact would only get this once. In addition, if you are attempting to send different campaigns to multiple lists at different times, a contact would get those emails accordingly. If the later is the case, We would advise to spread out your campaigns so a reader doesn't receive this information all at once.
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