Check the Return-Path and From fields. In many versions of this challenge:
: Look for X-Mailer or User-Agent headers. If it shows a script (like Python-urllib or PHPMailer ), it indicates an automated attack rather than a human sender. mail access_4.txt
: Look for base64 encoded strings in the Subject: field; decoding these often reveals the hidden flag. Common Findings in this Challenge Check the Return-Path and From fields
: You may be asked for the exact UTC time the mail was processed. mail access_4.txt