Well, think about the VPS you're proposing. Two euros a month is 24€ a year. Even if you're only paying yourself 6€ an hour, I'm skeptical that running an email

Well, think about the VPS you're proposing. Two euros a month is 24€ a year. Even if you're only paying yourself 6€ an hour, I'm skeptical that running an email server for 100 people would require less than four hours per year.