skylar# apt-get upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages have been kept back:
  courier-maildrop libsasl2 libsasl2-modules postfix postfix-mysql postfix-tls sasl2-bin
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
skylar# apt-get install postfix
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
  libsasl2 libsasl2-modules postfix-mysql postfix-tls
Suggested packages:
  postfix-pgsql postfix-ldap postfix-pcre
Recommended packages:
  mail-reader resolvconf
The following packages will be REMOVED:
  libsasl2-modules-mysql
The following packages will be upgraded:
  libsasl2 libsasl2-modules postfix postfix-mysql postfix-tls
5 upgraded, 0 newly installed, 1 to remove and 2 not upgraded.
Need to get 1333kB of archives.
After unpacking 221kB of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort.
skylar#