[Evolution] a lost email

["carpetnailz researchintegration org" <carpetnailz researchintegration org>]

Yesterday I was looking at an old email. This morning when I reopened
Evolution it was nowhere to be found. ???

I think maybe when I shut Evolution it was still open and I had to close
it separately. Could that have caused it to get lost? (It's not in Evo
trash or my Gnome trash.) If so, is there any way I can recover it?

Thanks.