How can I reactivate an old email address for my Apple Account?

Re: "I the past I had a email address but I have deleted it and now I want to use it again."

Wondering if you just deleted the email account from your iPhone, or whether you closed the email account entirely. For a third-party email address, (eg: GMail, Yahoo etc.) you could see if you can still log-in to the email provider's website.. Generally, if needed,you can get a new password for the account by clicking forgot password.

If you get the email account working ok:

See how to: Change your Apple Account primary email address - Apple Support

To find out whether you can still access the old account or not:

You can try entering that email address here : https://iforgot.apple.com/unlock

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If all else fails: Use account recovery only as a last resort when you can’t sign in or reset your Apple Account password any other way: See: How to use account recovery when you can’t reset your Apple Account password - Apple Support

or

See: How to create a new Apple Account - Apple Support

If needed: More info, support, contact options etc:

Apple Account support website: Apple Account - Official Apple Support