Dear {Mr./Mrs. Name},
My apologies! At {time} on {date}, I sent you an email intended for another one of my clients by mistake. The error was the result of my disordered notes and the new layout of my contact list.
The email that I sent prior to this one contains personal information and should therefore be considered confidential. Please disregard and delete it. I am very sorry that it was accidentally sent your way. If you would respond and confirm that the email has been deleted I would be most appreciative. Thank you.
Sincerely,
{Sender}
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