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README.md

Dovecot with imap, starttls, ldap authentication, sieve rules in ldap.

Uses SSMTP to send mails (for example if you have a redirect sieve rule).

Volumes

/var/lib/vmail/mail
/etc/ssl/mail:ro: certificates have to be here.

Environment Variables

HOSTNAME

Fully qualified name of the mail host.

SSMTP_MAIL_RELAY

Hostname and port for the used smtp relay (for example mail.example.com:587).

SSMTP_USER

User to authenticate agains the smtp relay.

SSMTP_PASSWORD

Password to authenticate agains the smtp relay.

SSMTP_AUTH_METHOD

default: LOGIN

Which authentication mechanism to use for the smtp relay.

SSMTP_USE_STARTTLS

default: yes

Whether to use starttls for the smtp relay.

LDAP_URI

Complete uri for the authentication ldap host.

LDAP_SIEVE_HOST

Has to be the same as LDAP_URI but in a different format (like ldap:389).

LDAP_BIND_DN

DN used to authenticate against ldap.

LDAP_BIND_PASSWORD

Password used to authenticate against ldap.

LDAP_BASE_DN

Base DN to look for users on the ldap host.

LDAP_SCOPE

default: subtree

Search scope of ldap queries.

LDAP_PASS_FILTER

Specifies the filter on how user is found on the ldap host. Dovecot variables can be used.

LDAP_USER_ATTRIBUTE

default: cn

The ldap attribute which stands for the username.

LDAP_PASSWORD_ATTRIBUTE

default: userPassword

The ldap attribute which stands for the password.

LDAP_SIEVE_ATTRIBUTE

default: sieve

The ldap attribute which contains the sieve rules.

LDAP_USE_TLS

default: yes

Whether to use tls when connecting to the ldap host.

LDAP_DEFAULT_PASSSCHEME

default: SSHA

Default password scheme used on the ldap host.

ALLOWED_USERNAME_CHARS

default: äöüabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@

List of characters allowed in a username.

AUTH_MECHANISMS

default: plain login

Space seperated list of supported authentication mechanisms.

CERT_DOMAIN

Name of the certificate domain.

SSL_DH_LENGTH

default: 2048

Length of the Diffie-Helman key in bits.

SSL_MIN_PROTOCOL

default: TLSv1

Ssl minimum protocol version.

SSL_CIPHERLIST

default: ALL:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH

Colon seperated list of supported ciphers (!disables a cipher).

Go here for a list of ciphers.

IMAP_MAX_USER_CONNECTIONS

default: 10

Maximum number of connections from the same user + ip.

Ports

Capabilities

CHOWN
DAC_OVERRIDE
FOWNER
NET_BIND_SERVICE
SETGID
SETUID
SYS_CHROOT