[104.231.205.87])
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for
Thu, 10 Dec 2015 06:53:42 +0000 (UTC)
104.231.205.87 is not mail.vistomail.com. It's some residential IP, cpe-104-231-205-87.wi.res.rr.com.
I feel like the mailing list must be seriously misconfigured to allow this sort of spoofing... You could exploit this to send mail "from" any of the devs, for example.
I just saw this in the bitcoin Dev mailing list
I have no idea if this is legitimate, but it was sent (supposedly) by [email protected], which is the first email address that he used to post about bitcoin.