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Explanation: Marta, I translate this as "See below." If the purpose is to direct the reader to something written down below, "see below" is a common way of doing this in English. ProZ will not permit me to write "see below" in the answer line (see above), so I put your query there instead.
Explanation: A header is "en-tête" in French. In an email, it's the part of the message that you find in the source code (it is invisible when you read the email), and that processed automatically by the email servers. In this part, you'll find the sender's email address, the sendee's email address, etc.