Compose an Apology Email

Draft a sincere and professional apology email to '[Recipient, e.g., a client, my manager, a colleague]' regarding '[Specific Issue/Mistake, e.g., 'the delay in delivering the project report', 'an error found in the recent invoice', 'missing our scheduled meeting']'. The email should:
1. Clearly acknowledge the mistake/issue without making excuses.
2. Express sincere regret or apology.
3. [Optional: Briefly explain the cause if appropriate and concise, without deflecting blame.]
4. Outline any steps being taken to rectify the situation or prevent recurrence.
5. Reiterate commitment or offer a way to make amends (if applicable).