SMail - Secure Email

SMail - Secure Email


(3 stars)


Download for Android Like

5,000 - 10,000 downloads

Add this app to your lists
SMail - Secure Email client for message encryption and authentication

User manual:

Security Features:
- S/MIME certificate public key or password based encryption and decryption
- S/MIME private key sign and signature verification
- S/MIME compress
- Supports S/MIME on POP3, IMAP4, SMTP and Microsoft Exchange ActiveSync
- Various format support: Clear text or opaque signing, binary encoding for internal attachment to reduce message size
PKI (Public Key Infrastructure) support:
- Certificate chain verification with revocation checking
- Resolve contact certificates on LDAP and Exchange server (No pre-installation of contact certificate is required for an enterprise PKI)
- Options on the certificate and CRL caching and refreshing
- Auto retrieval of CRL and intermediate CA based on information in the certificate
- Validate certificate revocation status using OCSP
- Validate signing certificate with Exchange server
- Well balanced between security and usability
- Supports smart card (PKCS#11 or java key store. Still looking for public smart card middle-ware solution)

Algorithms support:
RSA, 3DES, AES, SHA1, SHA256, SHA512

Free edition has advertisement.
You can try the full functions for 14 days after installation. (Some functions and Exchange support may be disabled after the free trial period).
You can purchase to remove advertisement and enable advanced features:
Advanced features: AES256, SHA256, SHA512, CRL, OCSP, LDAP
Exchange: Use Exchange account, AES256, SHA256, SHA512,

Email client features:
- IMAP push and Exchange ActiveSync push
- Exchange ActiveSync contacts and calendar synchronization, GAL
- Two pane view mode for tablet
- Compose message in HTML rich text
- Mailboxes list widget

What is encrypted:
Private keys, password, draft messages (derived device key or user's public key), some security settings
What is not:
Normal plain text messages. (Application password is for access verification and not used for full database encryption)

User Manual:
Please press the help button when creating an account.

Known issues:
- If you setup an Exchange account and set SMail as device administrator, later if you want to uninstall SMail, please go to Settings -> Security -> Device administrators and un-check SMail before uninstallation.
- S/MIME Compression is a component of S/MIME to reduce the message size and encryption processing time. It is only effective if the message has a very long text or is signed/encrypted and internal attachment encoding is "binary"
- Password based encryption, compression and binary encoding may not be well supported by other email clients which support S/MIME and may cause problems. Please test before real use
- PGP is not supported but in planning

Planned features:
More email operations, Search, Exchange Tasks and Notes

For the name Gimy, it should be pronounced like Jimmy, which means highly classified secret in Chinese.

Oops, the app crashed!!!
-> Post a complain -> Nothing changed -> We are all unhappy
-> Send developer an email to seek for help -> Problem is fixed -> We are all happy
This developer is willing to help. If you find any bugs or have any problem, feel free to send a message to .
Please describe your problem in details and provide as much information as you can.
Thank you!

Tags: smail, cliente de correo smail, smime, smail vs send inc, 안드로이드 smail, activesync smime, mail client s/mime, exchange smime, s/mime exchange activesync, s/mime support.

Recently changed in this version

Bug fixes

Comments and ratings for SMail - Secure Email
  • (46 stars)

    by Tirami Gezim on 20/11/2014

    I have already paid for all 3 levels/algorithms and still am getting "No decryptable entry found" when trying to open encypted emails. I have tried with 2k and 4k rsa certs generated in Smail and 3des... and plenty others option and always the same. Weather I'm sending emails to my self or to my colleagues within the same or other domain, having my contact cert registered/imported -always the same

  • (46 stars)

    by Steve Samson on 17/11/2014

    Didn't like the ads eithdg

  • (46 stars)

    by Bill Auclair on 26/10/2014

    Cannot delete Exchange emails from one user (even after they have been deleted from the server). Also people are telling me that some digitally signed messages I send (with Comodo cert) are coming through blank. Minor annoyances in an otherwise useful and full-featured application.

  • (46 stars)

    by John Senchak on 15/10/2014

    A very slick email app Worth paying money for to remove advertisements works great on Samsung tablets

  • (46 stars)

    by Ian Gong on 10/09/2014

    Just switched to an Android phone and tried just about every Exchange ActiveSync mail app on the market. All of them had one issue or another: requires paid subscription, duplicates emails, won't connect, slow to forever sync...etc. Finally found an app that was stress free to setup, completely free to use, and makes my life easier now that I'm connected to my corporate account.

  • (46 stars)

    by Ashutosh Tiwari on 01/06/2014

    This the actual email client which I am looking for ..and best thing is HTML editing with bold,underline etc....1 star less due to font color options is not enable place fix it..

  • (46 stars)

    by Dave Brown on 22/05/2014

    This is the best android app I've found so far that supports inbound and outbound encryption on an Exchange account.

More comments