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I want to apologize for some mistake in official mail and want to make them sure I will not do that again.

"I will take care of this next time" .

or

"I will take care of this onwards".

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  • take care of something means to handle something.
    – Lambie
    Apr 7, 2021 at 19:47

3 Answers 3

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You could simply say:

"I apologize for the error and it will not happen again."

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Steve's suggestion is the best, but if you want to apologise in a more formal way, then: I deeply regret what occurred, and I promise that I will make every effort and do everything in my power to prevent its reoccurrence. (Very formal)

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  1. I'm really sorry for XYZ (i.e. for what happened). It won't ever happen again.

Suitable for many situations where you realize you have made an awful blunder.

  1. Please forgive me. I committed a terrible error of judgement.

This could be said to a family member or a friend when you need to express contrition. You can forgo the second sentence.

  1. Please accept my/our (most sincere) apology/apologies. Needless to say, it will not happen again.

Terse and very formal, perhaps more appropriate in a business environment.

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