On Sun, 18 Sep 2016 16:04:40 -0700 William Sloan wrote:
X-Mailer: Apple Mail (2.3124)
> I have a long running email thread with some friends that
> yesterday when I attempted to reply to a message I got an error that
> the message could not be delivered because it was not RFC 2822
> compliant. I had responded to this email thread in the past with no
> issues and I can send and receive other emails without any issues.
Check for updates to your Apple Mail client. Some older versions don't
wrap headers. As it is a long thread, there are probably many entries
in the References: header, making the lines tooooo loooonnng.
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