Hmm, interesting. I'm now downloading the archive and going to run through and check again.

Edit: Huh, guess Wikileaks has a hard 40Mbit down limit for downloads, this might take a while.

Edit 2:

Not sure if this is due to time since leaks, and weirdness, but one such email I found was https://wikileaks.org/podesta-emails/emailid/41063

    dkim.ValidationError: body hash mismatch (got xYeNHE1y7S7c90FEmj0Clvuu8UkskqNWL3LiuMxCrsc=, expected SFTNrt5rWQXzb3TEj9vxbo/FLGDSOiYFg+04PjFRv3A=)

While I'm finding valid headers, I'm finding a good portion of negatives too. I have to sort through the spam emails in his inbox first though (lots of irrelevant DKIM failures).

Edit 3:

Just some numbers (which are definitely inflated from the spam emails I found, by how much I'm not sure):

  root@ubuntu-512mb-nyc1-01:/mnt/volume-nyc1-01# cat output | wc -l
  9981
  root@ubuntu-512mb-nyc1-01:/mnt/volume-nyc1-01# cat totest | wc -l
  28024
  root@ubuntu-512mb-nyc1-01:/mnt/volume-nyc1-01# ls out/ | wc -l
  50887

Edit 4 (and the last):

The quick script thrown together to put numbers together, https://gist.github.com/Omeryl/c6cbe603721f5671b9056ca127399.... I don't have the time to go through and see how many of those messages are spam that are just failing to validate, etc. It's worth noting that some messages may be failing to validate because x= is past, etc, as well.