Apple Mail won't display messages in HTML

I'm using Apple Mail on my laptop to check email from an account other than iCloud and Gmail.  I also use my iPhone and iPad to check mail from this same account.  Sometimes, newsletters are appearing in Apple Mail in plain text format, and not in HTML format.  What's unusual is that these same messages appear in HTML format on both my iPhone and iPad, so I'm guessing it's not a problem with my mail server, but with the Apple Mail application.  Are there any settings in Apple Mail to ensure I view all messages in HTML format?
Thanks!

Emily -
My wife is having the same problem with her new MacBook Air. She never saw the problem on the old first-gen Air running Snow Leopard.
Here's what's going on:
The messages that are having the problem are encoded as multipart/alternative. That is, they contain this in the received message:
MIME-Version: 1.0
Content-Type: multipart/alternative;
          boundary="----=_Part_2836956_1545934347.1333570398993"
Downstream, you'll find that boundary string whenever a new "part" begins:
------=_Part_2836956_1545934347.1333570398993
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
This begins the first part...the plain text part. On down the stream, you'll find the part header again:
------=_Part_2836956_1545934347.1333570398993
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.=
w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
That final <html> tag begins the bulk of the HTML code to render the graphical page. The block must end with a </html> tag to indicate the end of the block...but in this message the last line is:
<td style=3D"color: #000000; text-decoration: none; font-size: 10px; font-f=
amily: Arial,Helve
...and that's it. Obviously, the last word should have been "Helvetica" but ***the message was cut off***. I know this because if I open the message source window for the the same message in the gmail section (not the inbox section) the end of the message looks like this:
</body>
</html>
------=_Part_2836956_1545934347.1333570398993--
...which is what I'd expect in a multipart MIME encoded message.
The amount of data that's missing from the end appears to be about one network packet's worth. I suspect what's going on is that mail is erroneously discarding the final packet of some mail messages.
BTW, I've taken the computer to the Genius bar, and we took the time to create a new user account and a clean mailbox and duplicated the problem there in the store. The genius was unable to recommend a solution to the problem, and suggested that I perform a reinstall-in-place of the OS. Haven't done that yet, as I consider that pretty thin gruel from the perspective of fixing the problem.
In the meantime, I'm trying Sparrow mail as an alternative mail client. So far, I haven't seen the problem using Sparrow (nor, for that matter, on OSX Snow Leopard.)
Sorry I can't be more helpful, but I'll post back in this forum if I come up with a solution. I'll follow the thread...if anybody has any ideas what might be going on please post.

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