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@docker-mailserver Docker Mailserver

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plord12
Mar 16, 2026

I'm looking to integrate a simple mail list manager such as https://github.com/wansing/ulist or https://github.com/bartobri/listfix

I see they tend to use sendmail to deliver new emails to the list - this means that outgoing emails on the list are not DKIM signed.

Is there a way to enable DKIM (via rspamd) signing when sendmail creates a new email, or is there an alternative to sendmail which does hook into rspamd ?

I'm testing sendmail with something like -

echo 'Subject: Test from sendmail
From: root@domain.co.uk
To: testuser@gmail.com

This is a test, please ignore' | docker exec -i mailserver sendmail -f root@domain.co.uk testuser@gmail.com

(resulting email arrives but isn't signed with DKIM)

Thanks
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plord12
Mar 16, 2026
Author

Oh, I wonder if I need

non_smtpd_milters = $rspamd_milter
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plord12
Mar 17, 2026
Author

This is what I did to integrate the ulist list manager into docker-mailserver

Build ulist -

cd docker-data/dms/config
mkdir maillist
cd maillist
git clone https://github.com/wansing/ulist.git
cd ulist
go build ./cmd/...

Update main.cf -

cd docker-data/dms/config
add to postfix-main.cf
  non_smtpd_milters = $rspamd_milter
  transport_maps = socketmap:unix:/run/ulist/socketmap.sock:name

Update user-patches.sh -

cd docker-data/dms/config
add to user-patches.sh
  mkdir -p /run/ulist
  echo '[program:ulist]
  startsecs=0
  stopwaitsecs=55
  autostart=true
  autorestart=true
  stdout_logfile=/var/log/mail/ulist.log
  stderr_logfile=/var/log/mail/ulist.log
  command=/tmp/docker-mailserver/maillist/ulist/ulist -http 0.0.0.0:8080 -weburl https://PUBLIC_DOMAIN -superadmin ADMIN_EMAIL -starttls 587
  environment=STATE_DIRECTORY=/var/mail-state/ulist
  ' > /etc/supervisor/conf.d/ulist.conf
  supervisorctl reload

Where PUBLIC_DOMAIN is url of publically accessible list management url and ADMIN_EMAIL is the super admin email address (easiest to use an already configured email account & password)

Expose list admin port

add to compose.yaml an extra port

  services:
    mailserver:
      ...
      ports:
        ...
        - "9080:8080"  # ulist admin

Ensure your webserver PUBLIC_DOMAIN is forwarded to this host port 9080

Restart docker-mailserver

Use ADMIN_EMAIL with smtp password to log into PUBLIC_DOMAIN and create an email list.
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