Add an environment variable for Certbot

.env

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+# Mailu main configuration file
+#
+# Most configuration variables can be modified through the Web interface,
+# these few settings must however be configured before starting the mail
+# server and require a restart upon change.
+
+###################################
+# Common configuration variables
+###################################
+
+# Set this to the path where Mailu data and configuration is stored
+ROOT=/mailu
+
+# Mailu version to run (stable, 1.0, 1.1, etc. or latest)
+VERSION=latest
+
+# Set to a randomly generated 16 bytes string
+SECRET_KEY=ChangeMeChangeMe
+
+# Address where listening ports should bind
+BIND_ADDRESS=127.0.0.1
+
+# Main mail domain
+DOMAIN=mailu.io
+
+# Exposed mail-server hostname
+HOSTNAME=truc2.mail.mailu.io
+
+# Postmaster local part (will append the main mail domain)
+POSTMASTER=admin
+
+# Docker-compose project name, this will prepended to containers names.
+COMPOSE_PROJECT_NAME=mailu
+
+###################################
+# Optional features
+###################################
+
+# Choose which frontend Web server to run if any (value: nginx, none)
+FRONTEND=nginx
+
+# Choose which webmail to run if any (values: roundcube, rainloop, none)
+WEBMAIL=rainloop
+
+# Expose the admin interface in publicly (values: yes, no)
+EXPOSE_ADMIN=yes
+
+# Use Letsencrypt to generate a TLS certificate (uncomment to enable)
+ENABLE_CERTBOT=True
+
+###################################
+# Mail settings
+###################################
+
+# Message size limit in bytes
+# Default: accept messages up to 50MB
+MESSAGE_SIZE_LIMIT=50000000
+
+# Networks granted relay permissions, make sure that you include your Docker
+# internal network (default to 172.17.0.0/16)
+RELAYNETS=172.16.0.0/12
+
+# Will relay all outgoing mails if configured
+RELAYHOST=
+
+# Fetchmail delay
+FETCHMAIL_DELAY=600
+
+###################################
+# Developers
+###################################
+
+# Uncomment this to enable debugging globally
+# DEBUG=False