When you save email conversations or messages you chose wether to save each email message in a seaprate PDF or to merge them together. That is controlled by the following two options:

  1. Save each message (conversation) into a separate PDF
    When enabled, then each email message (or conversation) will be in a separate PDF file. All PDF files will me ziped into zip file.
  2. Merge all messages (conversations) into one PDF
    When enabled, then all email messages (or conversations) will be merged into one PDF file.