DKIM Support

This release features an initial support for DomainKeys Identified Mail (DKIM) inside the container image.

Just create the keys using:

opendkim-genkey -s mail -d example.org

and mount the keys into /etc/opendkim/keys.

More information is available in README.md.

Happy 2019

This is the first "official release" of the Docker postfix container.

See README.md for details on how to run it. Some samples are in the sample directory.

Major changes since the latest (unreleased) version:

• TZ environment variable to set the timezone of the container
• Better support for TLS connections to relay severs using the RELAYHOST_TLS_LEVEL variable and referencing the ca-certificates.crtfile
• Ability to setMESSAGE_SIZE_LIMIT for email messages
• The possibility to enable debugging with INBOUND_DEBUGGING parameter
• ALLOWED_SENDER_DOMAINS is now a required parameter as newer versions of postfix won't start without it

Minor changes:

• some nice colours of log files if running in terminal
• bash was removed from the container as the script is 100% sh-compatible