Hello,
To be like hotmail and gmail email provider, you need a proper plan to do so.
Free email provider (hotmail level) have extremely high entry barrier. You need to have excel capacity in these field :
1. Knowledge
2. capital
3. man power
4. strong branding
5. technology
list go on.
But if you intend to make free email for your community, then use third party email provider solution.
Thank you,