felix-engelmann/docker-davmail

Small docker of DavMail based on Alpine Linux

DavMail docker

(c) 2018-2020 Óscar García Amor

Redistribution, modifications and pull requests are welcomed under the terms of GPLv3 license.

DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.

This docker packages DavMail under Alpine Linux, a lightweight Linux distribution.

Visit Docker Hub or Quay to see all available tags.

Run

To run this container, simply exec.

docker run -d \
  --name=davmail \
  -p 1025:1025 \
  -p 1389:1389 \
  -p 1110:1110 \
  -p 1143:1143 \
  -p 1080:1080 \
  connectical/davmail

Default config points to Office 365 EWS.

Volumes

If you want reconfigure DavMail with your own davmail.properties you can mount it as a volume.

docker run -d \
  --name=davmail \
  -v /my/own/davmail.properties:/etc/davmail/davmail.properties \
  connectical/davmail

In the same way you can configure a volume to persistent store the logs.

docker run -d \
  --name=davmail \
  -v /my/own/davmail/logdir:/var/log/davmail
  connectical/davmail

Take note that DavMail is running by davmail user (UID 100) inside Docker. You must set proper permissions in your external volume to allow to this user to write on it.

Shell run

If you can run a shell instead DavMail, simply do.

docker run -t -i --rm \
  --name=davmail \
  --user=root \
  --entrypoint=/bin/sh \
  connectical/davmail

Please note that the --rm modifier destroy the docker after shell exit.

MFA Office365

The headless version of davmail does not yet support a shell based authentication process to log in with a second factor.

A workaround is to install the GUI enabled davmail on a desktop and authenticate with the O365Interactive method. After successful authentication, it is possible to extract the davmail.oauth.<user@email.tld>.refreshToken={AES}... from the .davmail.properties file.

Copy this key to your server configuration and set the connection mode to

davmail.enableEws=EWS
davmail.authenticator=davmail.exchange.auth.O365Authenticator

davmail.oauth.<user@email.tld>.refreshToken={AES}...

When a client connects to the davmail bridge, the password is used to decrypt the authentication token.