Apology Letter For Sending Package Late
Dear {Recipient},
My apologies for not sending your package right away. Because {reason}, I wasn't able to go to the post office on {date} as I had originally planned. I know how important the contents are to you and how much you were looking forward to getting them.
I was able to mail your package {this morning/earlier today} and I chose the expedited option so that you will receive it ASAP. Please expect your package to arrive in {number of} days. Once again, I'm sorry for the delay.
Best,
{Your Name}