filter_begin

Called once the email is ready to be processed

sub filter_begin () {
    # ALWAYS drop messages with suspicious chars in headers
    if ($SuspiciousCharsInHeaders) {
        action_quarantine_entire_message();
        action_notify_administrator("Suspicious characters");
        # Do NOT allow message to reach recipient(s)
        return action_discard();
    }
    # Scan for viruses if any virus-scanners are installed
    my($code, $category, $action) = message_contains_virus();
    $FoundVirus = ($category eq "virus");
}