First commit. Need to add README and default configurations.

Dockerfile

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+FROM ubuntu:14.04
+MAINTAINER Thomas VIAL
+
+# Packages
+RUN apt-get update -q
+RUN apt-get -y upgrade
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install postfix sasl2-bin courier-imap courier-authdaemon supervisor libfam0 fam amavisd-new spamassassin clamav-daemon libnet-dns-perl libmail-spf-perl pyzor razor arj bzip2 cabextract cpio file gzip nomarch pax unzip zip zoo
+RUN apt-get autoclean
+
+# Configures Saslauthd
+RUN rm -rf /var/run/saslauthd && ln -s /var/spool/postfix/var/run/saslauthd /var/run/saslauthd
+RUN adduser postfix sasl
+RUN echo 'NAME="saslauthd"\nSTART=yes\nMECHANISMS="sasldb"\nTHREADS=0\nPWDIR=/var/spool/postfix/var/run/saslauthd\nPIDFILE="${PWDIR}/saslauthd.pid"\nOPTIONS="-n 0 -r -m /var/spool/postfix/var/run/saslauthd"' > /etc/default/saslauthd
+
+# Enables Spamassassin and CRON updates
+RUN sed -i -r 's/^(CRON|ENABLED)=0/\1=1/g' /etc/default/spamassassin
+
+# Enables Amavis
+RUN sed -i -r 's/#(@|   \\%)bypass/\1bypass/g' /etc/amavis/conf.d/15-content_filter_mode
+RUN adduser clamav amavis
+RUN adduser amavis clamav
+RUN echo "/dev/shm   /var/lib/amavis   tmpfs defaults,noexec,nodev,nosuid,size=150m,mode=750,uid=$(id -u amavis),gid=$(id -g clamav) 0 0" >> /etc/fstab
+
+# Enables Clamav
+RUN mkdir -p /var/log/clamav && chown -R clamav:root /var/log/clamav
+RUN (crontab -l ; echo "0 1 * * * /usr/bin/freshclam --quiet") | sort - | uniq - | crontab -
+RUN freshclam
+
+# Start-mailserver script
+ADD start-mailserver.sh /usr/local/bin/start-mailserver.sh
+RUN chmod +x /usr/local/bin/start-mailserver.sh
+CMD /usr/local/bin/start-mailserver.sh
+

start-mailserver.sh

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+#!/bin/sh
+
+echo "Regenerating 'vmailbox' for given users"
+
+echo "docker_mail_users => $docker_mail_users"
+
+echo "# WARNING: this file is auto-generated. Do not modify locally" > /etc/postfix/vmailbox
+while IFS=$'|' read -r login pass
+do
+	# Setting variables for better readability
+	user=$(echo ${login} | cut -d @ -f1)
+	domain=$(echo ${login} | cut -d @ -f2)
+
+	# Let's go!
+	echo "user '${user}' for domain '${domain}' with password '${pass}'"
+	echo "${login} ${domain}/${user}/" >> /etc/postfix/vmailbox
+	userdb ${login} set uid=5000 gid=5000 home=/var/mail/${domain}/${user} mail=/var/mail/${domain}/${user}
+	echo "${pass}" | userdbpw -md5 | userdb ${login} set systempw
+	echo "${pass}" | saslpasswd2 -p -c -u ${domain} ${login}
+	mkdir -p /var/mail/ifusio.com
+	maildirmake /var/mail/${domain}/${user}
+
+done < /etc/postfix/docker-mail-users
+makeuserdb
+
+echo "Postmap configurations"
+postmap /etc/postfix/vmailbox
+postmap /etc/postfix/virtual
+
+echo "Fixing permissions"
+chown -R 5000:5000 /var/mail
+
+echo "Creating /etc/mailname"
+echo $docker_mail_domain > /etc/mailname
+
+# echo "Mouting /var/lib/amavis as tmpfs"
+# mount /var/lib/amavis
+
+echo "Starting daemons"
+/etc/init.d/fam start
+/etc/init.d/saslauthd start
+/etc/init.d/courier-authdaemon start
+/etc/init.d/courier-imap start
+/etc/init.d/spamassassin start
+/etc/init.d/clamav-daemon start
+/etc/init.d/amavis start
+/etc/init.d/postfix start
+
+echo "Listing SASL users"
+sasldblistusers2
+
+echo "Starting supervisord"
+tail -f /var/log/mail.log