App that sends texts from Mac computers and BCCs recipients

Hi, I'm new to this. I am looking for an app/program/software that can send texts from a mac computer and BCC the recipients. My work is looking into it to notify groups of people about upcoming events, but we do not want to give out anyone's personal information, or use someone's personal cell phone. Instead we would like to use an office computer and also, preferably load the numbers via excel (although this is optional). Any recommendations? I am not super tech savvy so any help would be much appreciated!