Both are correct. The 2nd is the more formal version. Edit: Rather than 'the needful', you should say 'as/what's required'. ie."Please do as required as per the email below"

As a former proofreader/copy editor this error makes my toes curl!! ‘… email below …’ is correct.

"Please do the needful as per the email below" is correct.

I disagree with Greg here. 'Below'is a preposition that shouldn't be used as an adjective/identifier like 'back room' or 'top drawer'. It cannot be used attributively, in other words before a noun to qualify it. You should place it after the noun and an article is also needed: the e-mail [which/that is] below. However, like many phrases, such use is creeping into English emails (undesirable, IMHO) such as the detested 'I'll check and revert' - Ugh!! Greg's final solution would be the most ideal version.

Hi! I logically think that is correct to say:the email below ,because of the formation of the sentence,there’s rules to follow in English while when we say:the below email it’s like we following Portuguese rules. I’m wrong?