Beginning with version 1.29. Aqua Mail supports S/MIME encryption.


  • An existing S/MIME certificate (.pfx) or (.p12) on your Android device
  • Aqua Mail Premium

Adding your certificate

  • In Aqua Mail, open Settings > Manage Accounts > Choose an e-mail address > End-to-End encryption
  • Enable S/MIME and select your encryption algorithms
  • Tap on the Certificate repository

Certificate repository

  • Certificates in use by your accounts are available here and divided into two categories - your account's certificates and other (user) certificates
  • To add a new certificate file, tap the + icon
  • To review information on existing certificates, tap on the respective certificate