mail.ull.at Recherche & Links
http://wiki.dest-unreachable.net/pages/viewpage.action;jsessionid=124DF1683BA551A699BB6448BB6704DC?pageId=5276023
http://moens.ch/2012/05/31/providing-email-client-autoconfiguration-information/
http://www.hetzner.de/hosting/ssl/zertifikat
http://developer.gauner.org/ispmail-exim/
https://workaround.org/ispmail/squeeze/setting-up-dovecot
READ: https://www.heinlein-support.de/blog/security/perfect-forward-secrecy-pfs-fur-postfix-und-dovecot/
http://www.dovecot.org/list/dovecot/2014-January/094324.html
The Guide we used:
http://www.exratione.com/2012/05/a-mailserver-on-ubuntu-1204-postfix-dovecot-mysql/