TIpHeaderTypes

type TIpHeaderTypes = (

  htBCC,

  htCC,

  htControl,

  htDate,

  htDispositionNotify,

  htFollowUp,

  htFrom,

  htInReplyTo,

  htKeywords,

  htMessageID,

  htNewsgroups,

  htNNTPPostingHost,

  htOrganization,

  htPath,

  htPostingHost,

  htReceived,

  htReferences,

  htReplyTo,

  htReturnPath,

  htSender,

  htSubject,

  htTo,

  htUserFields,

  htXIpro

);