This reverts commit 7b925b47.

They fill fail on first install as Dovecot doesn't know about
the new sieve plugins yet.

That support multiple instances

Add a slow (low-concurrency) outbound transport

See merge request !74

test: port to Python 3

See merge request !72

mail: backup ai_roundcube and ai_spam

See merge request !71

Users can now feed back ham/spam status into Spamassassin by
moving emails from/to the "Spam" folder. This is implemented
via imap-sieve as detailed in https://wiki2.dovecot.org/HowTo/AntispamWithSieve.

This sends all gmail emails to spam, it's a bit too high.

This reverts commit 20b16f3b.

The auth-server doesn't merge multiple service definitions properly
so we have to repeat the parameter in our override config.

Fixes issue ai3/accountadmin#15.

Mount noblogs robots.txt into the container

See merge request !70