Find original email

How do I find the original email that I received, it is addressed 'to' me, 'from 'me, 'reply' to me, but the message is legitimate from a legitimate company that I talked to earlier, I moved it to my Drafts, (using my iPhone) and when I want to reply to it from drafts it doesn't appear the way it was in my Incoming mailbox. the date shows when I opened it from Drafts not when it came in yesterday. And there is no way to reply to it. is there a way I can find the original email when I close out it the next time I open it is the time I opened it today not when I received it yesterday? I tried also on my MacBook Pro 'mail' and I also tried by opening my mail on Safari. Same situation.

I am not sure if the original came with a date, etc.? I know it sounds odd. But is there a way I can get the email as I received it in my inbox? Or am I going lampy? Appreciate it if someone can help me, please?

Any will be appreciated. Thank you.