Sending a message to the wrong person is read as fear of exposure, a private thought landing where it should not. Dream books tie it to slips, embarrassment and mixed-up loyalties.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.