Can I set up 50 or more email accounts for nursing home staff? No funding to purchase domain.

I am a Nurse Educator at a nursing home and trying to set up an email address for every staff member (50+ staff), this is so they can access educational materials. We have no budget for a domain name or to purchase business emails (this is a not for profit organization). I managed to set up three email accounts before being shut down. Most of our staff are either very reluctant to use their personal email accounts or simply do not have them as they are computer illiterate. Any suggestions please?