Hello @TanyaC066 ,
Since email addresses are what denotes a unique contact for sending and Compliance, there's not really a point to having "secondary email addresses" as a contact field. If you want to send to those secondary email addresses, I'd recommend re-uploading your list and selecting the secondary addresses for the email column for this round. The main email column you uploaded last time should be set as an ignorable column on the re-upload. That way those secondary email addresses will be recognized as actual, send-able addresses, and included in your sendouts.
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