*** ENVELOPE RECORDS test-queue-file18a.tmp ***
        0 message_size:             342             290               1               0             342               0
       97 message_arrival_time: Tue Dec 12 14:29:04 2023
      116 create_time: Tue Dec 12 14:29:04 2023
      140 named_attribute: rewrite_context=local
      163 sender_fullname: Wietse Venema
      178 sender: user@example.com
      196 named_attribute: dsn_orig_rcpt=rfc822;user@example.com
      235 original_recipient: user@example.com
      253 recipient: user@example.com
      271 pointer_record:               0
      288 *** MESSAGE CONTENTS test-queue-file18a.tmp ***
      290 pointer_record:             653
      653 regular_text: Header-Label: new-header-value
      685 pointer_record:             318
      318 regular_text: Received: by wzv.porcupine.org (Postfix, from userid 1000)
      378 regular_text: 	id 4SqTFD6TVpz4w4n; Tue, 12 Dec 2023 14:29:04 -0500 (EST)
      438 regular_text: Subject: test
      453 padding: 0
      456 regular_text: Message-Id: <4SqTFD6TVpz4w4n@wzv.porcupine.org>
      505 regular_text: Date: Tue, 12 Dec 2023 14:29:04 -0500 (EST)
      550 regular_text: From: Wietse Venema <user@example.com>
      590 pointer_record:               0
      607 regular_text: 
      609 regular_text: test
      615 pointer_record:               0
      632 *** HEADER EXTRACTED test-queue-file18a.tmp ***
      634 pointer_record:               0
      651 *** MESSAGE FILE END test-queue-file18a.tmp ***
