If you made a mistake that will not happen again and would like to apologize, here is a sample apology letter saying it will not happen again.
Date
To
[Recipient Name]
Subject: Apology for [Circumstance]
Dear [Recipient Name],
I offer the sincere apologies for [Circumstance] and regret any subsequent inconvenience it may have caused. I assure you that this will never be repeated, and you will not have to undergo service hereafter.
The circumstances were unforeseen; however, I will do my best to avoid them in the future. I hope you can forgive my actions.
Thank you for your consideration and support.
Sincerely,
[Your name]
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