OK I have recreated the problem as follows:

On my iPhone, I created a spreadsheet using the Numbers app. (I don't
think it matters what the attachment is, this is just an example). I
then sent this to myself by email. (It is not obvious [to me] how to do
this, I searched for it, then selected it from the cloud drive using the
"select" option, then clicked the upload symbol, and selected email.) I
can see this fine in SM (*), no problems.

Then, using the iPhone, I forward the message which I received from
myself to myself. I am asked if I want to include the attachments and I
say yes. I then look at the forwarded message in SeaMonkey (*) and I
cannot see the attachments when the message body is displayed as plain
text. However if I change View Message Body as HTML then I see the
attachment listed over on the right where I can select Save All etc.

(*) I am using IMAP so I can view the same message on iPhone or SM.

The first header is like this (I removed hex strings) :

--Apple-Mail-(hex stuff)
Content-Type: text/plain;
        charset=us-ascii
Content-Transfer-Encoding: 7bit

Then:

--Apple-Mail-(hex stuff)
Content-Type: multipart/mixed;
        boundary=Apple-Mail-(hex stuff)
Content-Transfer-Encoding: 7bit


--Apple-Mail-(hex stuff)
Content-Type: text/html;
        charset=us-ascii
Content-Transfer-Encoding: 7bit

(html stuff here)

--Apple-Mail-(hex stuff)
Content-Type: application/x-iwork-numbers-sffnumbers;
        name="Blank 2.numbers";
        x-apple-part-url=(hex stuff)
Content-Disposition: attachment;
        filename="Blank 2.numbers"
Content-Transfer-Encoding: base64

Then base64 encoded stuff (presumably the attached spreadsheet)

Then:

--Apple-Mail-(hex stuff)
Content-Type: text/html;
        charset=us-ascii
Content-Transfer-Encoding: 7bit

(html stuff)

--Apple-Mail-(hex stuff)

--Apple-Mail-(hex stuff)


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