How do I get emails on iCloud. Com

If you are already signed in with Apple ID and password say example1@gmail.com in an iPhone a new mail account can still be signed in using another mail address with its password that is already created say example2@icloud.com see the article https://support.apple.com/en-in/HT201320

https://support.apple.com/en-in/guide/iphone/ipha0d932e96/ios

And turn on mail box for iCloud account , so whenever you receive a mail from senders ( if you reveal your mail address say example2@icloud.com ) the mails can be viewed in iPhone https://support.apple.com/en-us/HT207132