The above Donna Brazile analysis can be downloaded in PDF form here: https://www.documentcloud.org/documents/3212723-Donna-Brazile-25.html
Utilizing the analysis of the database provided in the documents released as part of this Guide to Navigating Wikileaks, using the data from up through the 25th email dump, the answer can be given with a good degree of certainty.
From the overall analysis of the database structure there are 21 potential emails from Donna Brazile to John Podesta (or with Podesta sent a CC or BCC copy). Of these 13 have thus far been released (as of 11/1/16 and the Podesta 25 dump).
If we look at the map (see image above) we can see gaps in the records thus far released using the dark orange bands. This map shows the emails in the numerical order of their file name (an eight digit file such as 0001197.eml as the file name for the March 12th email above). This can be informative but caution must be kept in mind - the list is somewhat chronological but there can be (and in this case is) more than one group of chronologically associated emails in the list.
On first glance, using the non-chronological (by filename (number)) map, we can see two areas where further emails may likely be located. A gap exists between the two emails listed above where a single email from Brazile will eventually be released. And a further gap exists of two emails after the March 12th email and before a 2012 email (highlighted in light blue with the subject "badmouthing!").
What we do know is that at least one prior email to the second date, March 12th, was sent. You can see this in the body of the email thus far released. If you go down you find the line: "Here's one that worries me about HRC." This is followed by a verbatim statement of the text that was eventually read at the debate.
This prior email, quoted in this later one, has not yet been released. It is possible it is within the three gaps mentioned above. But it also may not have been received by Podesta, who only received the ones above because he was provided a copy of the original sent to Palmieri in the body of a follow-up by Palmieri to Brazile in which she added Podesta as a direct recipient. If Brazile did not copy Podesta on the original, which is not clear from the text of this email's body, that one will not appear in the Wikileaks files (at least not the Podeseta files). Palmieri's original inclusion of Podesta in this email chain can be found with file number 00021071.eml and is locatable using Email ID 5205. The original can be viewed on Wikileaks here (https://wikileaks.org/podesta-emails/emailid/5205) and can be downloaded here (https://wikileaks.org/podesta-emails/get/5205)
We can thus sort the emails already released by date to get another perspective on the matter.
PDF version of the above can be found here: https://www.documentcloud.org/documents/3212722-Donna-Brazile-25-Chrono.html
What we can see is that of the 13 released emails (out of 21 maximum) they span a chronological period from July 31, 2012 (Currently an outlier as all the other emails released are from 2016).
Another note of caution in analyzing the data. It is possible that emails from Brazile can be located elsewhere in the Podesta set. The database is set up once again utilizing a numerical series of 8-digit file names. These are generally grouped using an alphabetical series by the name of the sender. This can be the first letter of the first name (the dominant theme) but also can be the first letter of the last name. Also the name associated with an email that is used - may not be the only sender's name identified with a single email address. Thus, for example, info@hillaryclinton.com info @ hillaryclinton.com, may have more than one sender identified with it. Or the email address may appear, in some instances, without an associated name (and thus the first letter of the email address will tend to locate it numerically by filename).
For Brazile there are two email addresses associated with her name in the database: dccc @ dccc.org (I have spaced the "@" for formatting reasons in emails) which was used in the lone outlier from 2012. And donna @ brazileassociates.com which is used in the 12 others that have been released.
Analysis of the database thus far indicates that "Donna Brazile" appears 13 times - and thus matches the 13 emails in this list. 12 use the @brazileassociates.com address and 1 the dccc.org address thus accounting for all 13. However there 22 instances of the dccc @ dccc.org email account - only one having Brazile's name associated.
Sorting by the dccc account finds that eleven different users are associated with that account in addition to Brazile (who is indicated in that one 2012 email). A closer look to these reveals that they are all from the 2012 period and thus will not produce an email relevant to this question.
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