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5.1. Installation
See Section 1, “Postfix” [p. 262] for instructions on installing and configuring Postfix. To install the rest of the applications enter the following from a terminal prompt:
sudo apt install amavisd-new spamassassin clamav-daemon sudo apt install opendkim postfix-policyd-spf-python
There are some optional packages that integrate with Spamassassin for better spam detection:
sudo apt install pyzor razor
Along with the main filtering applications compression utilities are needed to process some email attachments:
sudo apt install arj cabextract cpio lha nomarch pax rar unrar unzip zip
If some packages are not found, check that the multiverse repository is enabled in /etc/apt/ sources.list
If you make changes to the file, be sure to run sudo apt update before trying to install again.