Google Authenticator

apt-get install libpam-google-authenticator
google-authenticator

/etc/ssh/sshd_config:

PasswordAuthentication no
ChallengeResponseAuthentication yes
AuthenticationMethods publickey,keyboard-interactive:pam
UsePAM yes

/etc/pam.d/sshd:

Line 1: auth [success=done new_authtok_reqd=done default=die] pam_google_authenticator.so nullok

Fritz!

Get all the tools here:
ftp://ftp.avm.de/fritz.box/tools/

Make host entry for:
192.168.10.1    fritz.box

Run FakeFax

Run Fritz!Fax Installation

Postfix Auth (Zarafa)

apt-get install sasl2-bin

/etc/postfix/sasl/smtpd.conf:

 pwcheck_method: saslauthd
 mech_list: plain login

/etc/postfix/main.conf:

 smtpd_sasl_auth_enable = yes
 broken_sasl_auth_clients = yes

/etc/default/saslauthd:

 START=yes
 NAME="saslauthd"
 MECHANISMS="rimap"
 MECH_OPTIONS="127.0.0.1"
 THREADS=0
 OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd -r"
adduser postfix sasl