There are specific guidelines for how to send your email, starting with the subject line. While you can mail or hand-deliver your note of apology, it may be easiest to send it by email. Thank you so much for your understanding. Please let me know if there is anything else I can do to reassure you and the rest of the company that I greatly value my position on the sales team, and that I will not let the team down again. From now on, I will also be sure to leave for meetings even earlier than I already do, so even in the case of an emergency, I will still be able to arrive on time. I was delayed due to my car breaking down, so I am getting my car serviced. I am currently taking steps to ensure that I am never late again for a client meeting (or any other work-related event). I, therefore, let down the entire sales team with my behavior.

I understand that, as a sales team, we need to always present ourselves as professional and reliable, and timeliness is a large part of that professionalism. My tardiness almost lost us a valuable client. I am extremely sorry for my late arrival at the important sales meeting with The Star Agency yesterday. Subject: Serena Holden - Meeting Attendance

Another word for running late