I have checked my inbox page and it is nowhere to be found (not in the spam, trash, etc.)

Seems I could get it through Yahoo Answers since they are the ones who forwarded the email to me?

I want to thank the woman who sent me further information on the portable spa. (My question on it was last summer but she still responded and it helped me!)
She didn't put an answer into Yahoo Answers, or I could then see her name and get in touch.....
This has happened twice to me. I'm thinking, as soon as I read the email, it just disappears? Is that possible?