[These are Sample apology email letter after you sent a wrong email to a client, business partner, supplier, manager, boss, etc with wrong contents or information. If it happens you should show Apology immediately. You can modify this format as your requirement.]
Date…
Client name…
Institute/company name…
Institute/Company Address…
Sub: Apology Letter for Sending Wrong Email
Dear Mr./Mrs. ABC,
I am writing to you because I would like to formally apologize to you for sending you an email that wasn’t meant for you. Yesterday (Date) I was going through all of my emails and trying to respond to them all and as I am the company director I have a lot of business emails. I guess I was so tired that I send you the wrong email and sent your one to someone else. (show actual problem and situation). Again I am so sorry for the inconvenience. Tomorrow I will send you your right email and next time I do all of my emails I will make sure to have plenty of coffee and sleep.
I hope you understand that you have to delete that email due to it containing security information for another client of mine.
Yours sincerely,
Name…
Job Designation…
Contact no and signature…