P.S. I usually add a sentence like “if you have other papers you think I should read, please include them.” Often an author will have more recent work related to a paper I’m requesting.
Since it’s a FAQ: what if corresponding author has changed email? That’s what ORCID is for. What if they have left academia? Most articles have multiple authors. If 2nd or last author email isn’t easy to find with search, try finding a different paper where they are corresponding author, get email.