set index_format="%4C %Z %{%b %d} %-15.15L (%?l?%4l&%4c?, %X) %s"

Current attachments settings:

attachments +A */.*
attachments +A text/calendar
attachments +A image/.*
attachments +A */.*
attachments -A text/x-vcard
attachments -A application/pgp.*
attachments -A application/x-pkcs7-.*
attachments -A message/external-body
attachments +I text/plain
attachments -I message/external-body

View of current message:
  I     1 <no description>                                  [multipa/alternativ, 7bit, 6.2K]
  I     2 ├─><no description>                               [text/plain, quoted, utf-8, 1.8K]
  I     3 └─><no description>                               [text/html, quoted, utf-8, 4.1K]
  I     4 IMG_2487.jpeg                                     [image/jpg, base64, 2.4M]