Red Hound Software's Secure Email Reader can be used to decrypt S/MIME encrypted email messages received using other email applications like gMail, K-9 Mail and Android Mail. See the contents of those p7m attachments (smime.p7m) you receive without returning to your desktop mail program.
Check out our getting started guide:
Explanation for required permissions:
* Take pictures and videos: you can use your phone's camera to scan QR codes instead of entering passphrases manually
* Internet Access: If you enable it in the settings (it's off by default) you can send error reports to our support server.
* Storage Access: You can use Secure Email Reader to save attachments to your SD card and read keys from your SD card.
Initial Release to Android Market