$attachment $attachment.base64 $attachment.headers $attachment.text $attachment.malformed $attachment.multipart $attachment.resource_fork $attachment.resource_fork.base64 $attachment.file_name $attachment.mime_type $body $body.html $body_part $body_part.size $body_part.headers $body_part.text $body_part.malformed $body_part.multipart $body_part.file_name $body_part.digest $body_part.resource_fork $body_part.resource_fork.size $body_part.resource_fork.digest
$data $data.size $data.digest $decode_base64 $empty $encode_base64 $json_escape $headers $headers.message_id $headers.in_reply_to $headers.references $headers.from $headers.sender $headers.reply_to $headers.to $headers.cc $headers.bcc $headers.subject $hmac $host
$ip $ip.dec $ip.hex $if_not_empty $gethostname $group $message_id $md5 $not_empty $pid $recipient $recipient.local $recipient.domain $recipient.component $sender $sender.local $sender.domain $sender.component $sha1 $size $size_hex $sp, $br, $cr, $lf, $crlf, $htab $subject $text_find_replace_all $thread $time $time6 $uri_escape $xml_cdata $xml_escape $year, $month, $day, $hour, $minute, $second