Currently, the docker script for the einsteintoolkit.org website is here: https://github.com/stevenrbrandt/et-websites

It builds with debian 9.7, but not newer versions. One problem is that the ssmtp package has been removed.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2298/the-etk-website-does-not-build-with-the