To dream that you are sending a message suggests that there is an important message that you need to convey and let others know. If you are unable to send the message due to some technical issues means that you are having difficulties getting your point through. You feel overlooked or unimportant.
To dream that you are receiving a message represents a message from your subconscious.
Dreaming that you write a message and then delete it before sending it means that there is something you want to get off your chest but are afraid of what others think or how you will be perceived. You tend to over think things.