the email from JaneとJane's email、どちらの表現が自然な英語だと思いますか。
Grammar: nouns as adjectives
One change you may want to make in your English is to use nouns as adjectives. Doing so has two benefits:
1) Your English would sound more natural.
2) Your sentences would be shorter.
Correct example 1: The invoice for April is attached.
Correct example 2: The April invoice is attached.
Both example 1 and example 2 are correct. However, example 2 sounds better.
Using nouns as adjectives shortens sentences, and shorter sentences are generally better than longer sentences.
Correct example 3: I read the email from Jane.
Correct example 4: I read Jane's email.