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}
Download this apology letter template — free!
Formatted and ready to use with Microsoft Word, Google Docs, or any other word processor that can open the .DOC file format.
Index of letter of apology templates