In our community, we send an automated welcome message to new members. We add whispers to discuss opportunities or things that might need doing, like deleting spammers (super rare), introducing them to members based on interests indicated in their profiles, handling the new member’s replies to the welcome message, etc.
Sometimes we change the title to distinguish the welcome messages from each other.
Sometimes we also assign messages to someone alongside the whisper to make sure someone is in charge of handling whatever needs doing.
We are really looking forward to tagging PMs, which in conjunction with whispering will go a long way to preventing any lost balls or confusion.