S/MIME for mails in Mac OS X and iOS

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• http://www.heise.de/ct/artikel/Brief-mit-Siegel-1911842.html
• http://.cacert.org
• http://wiki.cacert.org/EmailCertificates
• http://wiki.cacert.org/EmailCertificates Create your own key and let is sign by cacert
• http://wiki.cacert.org/Roots/Class3ResignProcedure ca cert with sha
• http://www.mecking.net/2011/02/installing-cacert-root-certifcates-on-ios/ import certs to ios
• https://discussions.apple.com/thread/5564648?tstart=0 why the root cert from cacert is not trusted by Apple
• and http://support.apple.com/kb/TS4133
• https://lists.cacert.org/wws/arc/cacert-de/2013-11/msg00012.html why export .p12 format for import in ios