unwanted reminders to secondary e-mail address

I occassionally send e-mails to Sandy from my secondary e-mail address. My understanding is that all reminders would go to my primary e-mail address and not my secondary e-mail address. But Sandy is sending one particular reminder to both my primary and secondary e-mail addressess. I would prefer that the reminder not go to my secondary e-mail address, but I see no setting where I can either allow or prohibit Sandy's e-mail reminders to the secondary address. Please help!
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