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linuxmonkey@SkullNet-Server:~$ sudo apt-get install postfix postfix-tls libsasl2 sasl2-bin libsasl2-modules libdb3-util procmail
Reading package lists... Done
Building dependency tree... Done
Package postfix-tls is a virtual package provided by:
  postfix 2.2.10-1ubuntu0.1
You should explicitly select one to install.
E: Package postfix-tls has no installation candidate