Dear {Name},
I have never in my life made a mistake of this magnitude. My depth of my personal regret and mortification is only exceeded by the remorse I feel for how my actions have affected {you/the team/etc.}.
Please accept my sincere apology. I have learned so much from this incident, especially in regard to how I should conduct myself in the future. For example, {changes}.
If there is any way that I can make amends, please don't hesitate to let me know. For example, {suggestion}. It won't be easy to atone for such a huge error, but I am determined to do my best.
Sincerely,
{Sender}
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