If you accidentally sent out an email with a wrong attachment, here is a sample apology letter for sending the wrong attachment.
Subject: Apology Letter for Sending Wrong Attachment
Dear [Recipient Name],
I am writing to sincerely apologize for sending you the wrong attachment in the mail [Date] under the subject [Subject]. I got confused between the two mails and sent you the other attachment by mistake. I understand this might have caused you inconvenience.
I accept my mistake and assure you that I have sent you the correct attachment to this email. Please check the files attached below and let me know if there are any changes required.
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