Problems sending digitally signed emails.

Hello there.
I have installed my certificate to use S/MIME with my Gmail account on my iPhone and I turned on the option to sign all outgoing emails, but the emails aren't being recognized as signed when I send a message. If I look at the email on my Gmail sent items using Gmail's web interface, there is an attachment in the sent mail called smime.p7s but Outlook didn't recognize the email as signed (and didn't show the attachment either), and neither did my iPhone (sending a msg to myself).
Using the same certificate, if I send a message using Outlook on my PC, it works fine.
Anybody had the same problem / know a solution?
Thanks,
Felipe.

Any client that does not support SMIME shows a .p7s file attachment. GMail web interface is one such client that does not support SMIME.
Penango is a cool service that adds a local firefox extension that adds SMIME support to GMail.
http://www.penango.com/
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