How can I see an email I sent on iPad?

DaveWam wrote:

How can I see that the email I sent has been read?

Include in your email a request that the recipient acknowledge that they have read your email. Do not expect too many acknowledgements back.

Normally, an automatic acknowledgement function is only available on corporate email accounts handled through the company's own servers.

I'm not seen a consumer-grade email service or mail client that offers this. However, you can check with your internet service provider to see if that is possible.