MESSAGING_EMAIL_CACHE_GET_DETAILS Messaging Endpoint
  /rpc/messaging/?method=MESSAGING_EMAIL_CACHE_GET_DETAILS  
  Click here to read a summary of Email Caching. If you are caching headers only, use this to populate the rest on an email. It will set body, and the attachment fields. Pass the cache id.  
  PARAMETERS TYPE NOTES
  CacheAttachments Text (1) Y / N [default]. Downloads attachments so that they are available to methods such as CORE_FILE_READ
  Id Numeric  
  RETURN  
  AttachmentCount Number of attachments on the email
  AttachmentList Delimited (with pipes) list of attachment names and their index
  Id  
  Message