Professional Etiquette Tips
When you don't answer an e-mail or a text, you send the signal that the person who sent it, or the subject matter, isn't important to you.
Reply to every message, if possible - even if it's just to say, "Sorry, don't the have time to respond right now. I will when I have a minute." Then follow through.
This tells the sender that you are accessible, and helps everyone feel part of a team.