Can I put a mac/icloud email on an imac running 10

You should be able to access any email service by entering the server and account details in the Mail application.

As to iCloud email, this is standard IMAP and you can access that by entering the account details. However in place of your normal password you will have to enter an app-specific password which you generate.

This page gives you the iCloud mail server settings:

Mail server settings for iCloud email clients - Apple Support

and a link to information about creating an app-specific password - note that to do this your Apple ID has to be protected by two-factor authentication:

Two-factor authentication for Apple ID - Apple Support

However to enable this you have to be using a more recent Mac or iOS device, or you may be able to do it on a browser as long as you have a phone number: Availability of two-factor authentication for Apple ID - Apple Support

No other iCloud facilities can be used on Snow Leopard.

You need macOS 10.7 Lion for basic iCloud and then later macOS versions for expanded services.

To check the Minimum system requirements go to > https://support.apple.com/en-us/HT204230

If you can not get Apple Mail to work with your E-Mail accounts.

see > https://support.tigertech.net/apple-mail-snow-leopard

Then you should be able to access your E-Mail accounts via Safari or another web browser.

https://login.aol.com/?

https://skyid.sky.com/signin/email

https://home.bt.com/login/loginform?