Alternativa Icedoveu za S/MIME sa besplatnom licencom

• S/MIME
  Sve platforme Windows Mac Linux Chrome OS Android iPhone Apple Watch Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Firefox BSD Windows Mobile Xfce Haiku PortableApps.com F-Droid S60 elementary OS GNOME OpenPGP S/MIME
• Besplatna licenca
  Bilo koja licenca Besplatna licenca Licenca otvorenog koda Komercijalna licenca