How can I get an email account through Mac.com?

I think mac.com email addresses were phased out over 10 years ago. Apple offers icloud.com email now:

Create an email address in iCloud Mail - https://support.apple.com/guide/icloud/create-an-icloudcom-email-address-mmdd8d1c5c/icloud

iCloud: About your @icloud.com, @me.com, and @mac.com email addresses - https://support.apple.com/HT201771

"Depending on when you created your iCloud account, your iCloud email addresses and aliases may end with @icloud.com, @me.com, or @mac.com domains. Learn how these email addresses are granted."