Dear {Name},
I would like to apologize and offer my utmost regret for the unprofessional and inappropriate behavior I exhibited on {day}. The workplace is not the place for a {confrontation/outburst/etc.}.
I hope that you can forgive me for my lapse in professional conduct. I assure you that it will not happen again.
Sincerely,
{Sender}
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Index of letter of apology templates