Domain and Email Separation from Personal Account

I need help separating my business domain and email from my personal account. The domain has already been transferred to Squarespace, but I has been been linked to my personal email. The business email and my personal email are connecting, I would like to separate them. Also, I am unable to send any emails through the business account.

Key Requirements:
- Expertise in domain transfer setup and DNS configuration
- Proficient in setting up business email accounts
- Experience in ensuring domain confidentiality and privacy