How do I stop iCloud emails from being rerouted?

"How do I stop iCloud emails from being rerouted?: Someone is rerouting certain calls and iCloud emails are being rerouted to somewhere else. Anybody else ever experienced this"

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Turn Off Call Forwarding:

1. Go to: Settings
2. Tap: Phone
3. Tap: Call Forwarding
4. Toggle: it off

and...

Stop Forwarding eMail:

Go Here: Automatically Forward eMail in Mail on iCloud.com - Apple Support

1. Go to: icloud.com/mail
2. Sign in: to your Apple Account
3. Select: [the blue gear] at the top of the Mailboxes list
4. Choose: Settings
5. Select: Mail Forwarding in the sidebar
6. Deselect: “Forward my email to” checkbox

"my boyfriend isn’t getting some of the emails on his iCloud account they are being rerouted somewhere else"

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Secure your Info:

A. Verify your Devices:

Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

then...

B. Modify your Credentials:

Having received this, someone may have your credentials. So, by all means, consider modifying them...

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option