(In reply to Bob G from comment #50)
> (In reply to R. Diez from comment #48)
> > I would be grateful if anybody else could mention some other e-mail client, 
> > add-on or command-line tool which could delete attached files from signed 
> > e-mails.
> 
> I'd suggest [FairEmail](https://github.com/M66B/FairEmail) to delete 
> attachments in signed emails. It works flawlessly and it is open source.

Nice - as long as one has access to an Android phone and FairEmail can get hold 
of the email, 
which is not the case for non-standard (M$ Exchange) accounts.

As I wrote here 8 years back: 
https://bugzilla.mozilla.org/show_bug.cgi?id=288700#c32
here is a basic workaround I came up with many years before - shame this issue 
is way too old!

Use any tool or editor capable of manipulating the email (header), e.g., the 
"Header Tools Improved" add-on
* Change in the "Content-Type" header entry the "multipart/signed" to 
"multipart/mixed" and rename the "protocol" parameter, e.g.:
replace
  Content-Type: multipart/signed; protocol="application/x-pkcs7-signature";
by
  Content-Type: multipart/mixed; 
protocol="application/x-pkcs7-disabled-signature";

Then the email will no more be considered signed and the signature will show up 
as an additional attachment that can be ignored.
Now the email attachments can deleted/detached as usual.

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https://bugs.launchpad.net/bugs/303140

Title:
  No more "Save all" / "detach all" / "delete all" for attachments

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