If the email were to be addressed to a specific person, you could write "Dear [Name]".
But is it appropriate to write "Dear [Team / Department / Company]"?
For example, "Dear Service Desk," and "Dear Microsoft,".
Learn English – the correct greeting to use in a formal email addressed to a department/team/company
emailformality
Best Answer
If it's within your own company you can use simply "Colleagues,". If specifically your own team, then "Team,". (i.e. no "Dear" or "Hi" needed)
If it's not your place of work, then the usual "Hi" or "Hello" will do.