Dear {Boss Name},
I'm very sorry, but the {required work} didn't go out today. I know that it was due at {time} and will be {amount of time} late. It's my fault; I should have allowed for an extra day of {proofing/editing/quality control checks} before I sent it out.
I apologize for the delay. I've spoken to {contact} to make sure that the {required work} gets out as soon as possible. I will make sure this doesn't happen again by scheduling the checks two days beforehand instead of one.
Sincerely,
{Name}
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Index of letter of apology templates
