How to apologize for sending a message to a leader without a title?

1. Send a short message or email to the leader immediately to apologize and explain the situation. For example, "I'm very sorry, I forgot to use my address in the message I sent you just now, and I'm deeply sorry about that." This is my negligence, please forgive me. "

2. In the next face-to-face communication with the leader, personally apologize to the leader. You can say, "I'm very sorry that I forgot to use the address when I sent you a message earlier." This is my negligence, and I will pay more attention to it in the future. "