The sender was using Thunderbird, sending mail through their ISP's
SMTP server.  Hotmail was not involved.

When I got home, I downloaded the message using Thunderbird and
GMail's POP server.  The digital signature is just fine when I
download it that way.

Thunderbird reports the signature as invalid only if I download the
message using the Webmail extension.  It may be that the extension is
modifying the message in some trivial way (e.g., deleting a trailing
space) that renders the signature invalid.

On Jan 6, 3:00 pm, KE4AVB <[email protected]> wrote:
> Gil,
>
> Your sender would not happen be use of the free Hotmail service would
> they? I have had problems sending signed and/or encrypted messages
> through their service. They are opening and adding Hotmail taglines to
> the messages sent thought their service thus invaliding the signatures
> and encryptions. The same problem could be happening to other service
> providers depending how they operate. The Hotmail problem occurs if I
> use the online webmail or not.
>
> Eugene
>
> On Jan 6, 3:45 pm, Gil <[email protected]> wrote:
>
> > Should the Webmail extension (with GMail - actually GAFYD) play nice
> > with S/MIME and digital signatures?
>
> > I have received some signed emails using the Webmail extension, and
> > Thunderbird is telling me that the signature is not valid (message has
> > been modified).
>
> > Other recipients of the same message report no problem with the
> > signature - they do not use the Webmail extension but just basic POP.
>
> > I can't try the same, as I am behind a corporate firewall and cannot
> > use POP.
>
> > It does seems that I am able to receive some emails via the Webmail
> > extension with valid signatures.  Only one sender seems to be affected
> > so far.  It may be that senders using plaintext for their messages are
> > not affected, but those who compose using HTML may have their messages
> > corrupted (by the Webmail extension?).
>
> > I am using:
> > - TB 2.0.0.23
> > - WebMail 1.3.5
> > - WebMail - GMail 0.6.5b1
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