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Use Cases | Forward-Only Mailserver with LDAP
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Forward-Only Mailserver with LDAP
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Forward-Only Mailserver with LDAP
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Building a Forward-Only Mailserver
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Building a Forward-Only Mailserver
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< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z" / > < / svg >
< / a >
< h1 > Forward-Only Mailserver with LDAP< / h1 >
< h2 id = "building-a-forward-only-mailserver" > < a class = "toclink" href = "#building-a-forward-only-mailserver" > Building a Forward-Only Mailserver< / a > < / h2 >
< p > A < strong > forward-only< / strong > mailserver does not have any local mailboxes. Instead, it has only aliases that forward emails to external email accounts (for example to a gmail account). You can also send email from the localhost (the computer where the mailserver is installed), using as sender any of the alias addresses.< / p >
< p > The important settings for this setup (on < code > mailserver.env< / code > ) are these:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > PERMIT_DOCKER< / span > < span class = "o" > =< / span > < span class = "s" > host< / span >
< span class = "na" > ENABLE_POP3< / span > < span class = "o" > =< / span >
< span class = "na" > ENABLE_CLAMAV< / span > < span class = "o" > =< / span > < span class = "s" > 0< / span >
< span class = "na" > SMTP_ONLY< / span > < span class = "o" > =< / span > < span class = "s" > 1< / span >
< span class = "na" > ENABLE_SPAMASSASSIN< / span > < span class = "o" > =< / span > < span class = "s" > 0< / span >
< span class = "na" > ENABLE_FETCHMAIL< / span > < span class = "o" > =< / span > < span class = "s" > 0< / span >
< / code > < / pre > < / div >
< p > Since there are no local mailboxes, we use < code > SMTP_ONLY=1< / code > to disable < code > dovecot< / code > . We disable as well the other services that are related to local mailboxes (< code > POP3< / code > , < code > ClamAV< / code > , < code > SpamAssassin< / code > , etc.)< / p >
< p > We can create aliases with < code > ./setup.sh< / code > , like this:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > ./setup.sh < span class = "nb" > alias< / span > add < alias-address> < external-email-account>
< / code > < / pre > < / div >
< h2 id = "authenticating-with-ldap" > < a class = "toclink" href = "#authenticating-with-ldap" > Authenticating with LDAP< / a > < / h2 >
< p > If you want to send emails from outside the mailserver you have to authenticate somehow (with a username and password). One way of doing it is described in < a href = "https://github.com/docker-mailserver/docker-mailserver/issues/1247" > this discussion< / a > . However if there are many user accounts, it is better to use authentication with LDAP. The settings for this on < code > mailserver.env< / code > are:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > ENABLE_LDAP< / span > < span class = "o" > =< / span > < span class = "s" > 1< / span >
< span class = "na" > LDAP_START_TLS< / span > < span class = "o" > =< / span > < span class = "s" > yes< / span >
< span class = "na" > LDAP_SERVER_HOST< / span > < span class = "o" > =< / span > < span class = "s" > ldap.example.org< / span >
< span class = "na" > LDAP_SEARCH_BASE< / span > < span class = "o" > =< / span > < span class = "s" > ou=users,dc=example,dc=org< / span >
< span class = "na" > LDAP_BIND_DN< / span > < span class = "o" > =< / span > < span class = "s" > cn=mailserver,dc=example,dc=org< / span >
< span class = "na" > LDAP_BIND_PW< / span > < span class = "o" > =< / span > < span class = "s" > pass1234< / span >
< span class = "na" > ENABLE_SASLAUTHD< / span > < span class = "o" > =< / span > < span class = "s" > 1< / span >
< span class = "na" > SASLAUTHD_MECHANISMS< / span > < span class = "o" > =< / span > < span class = "s" > ldap< / span >
< span class = "na" > SASLAUTHD_LDAP_SERVER< / span > < span class = "o" > =< / span > < span class = "s" > ldap.example.org< / span >
< span class = "na" > SASLAUTHD_LDAP_START_TLS< / span > < span class = "o" > =< / span > < span class = "s" > yes< / span >
< span class = "na" > SASLAUTHD_LDAP_BIND_DN< / span > < span class = "o" > =< / span > < span class = "s" > cn=mailserver,dc=example,dc=org< / span >
< span class = "na" > SASLAUTHD_LDAP_PASSWORD< / span > < span class = "o" > =< / span > < span class = "s" > pass1234< / span >
< span class = "na" > SASLAUTHD_LDAP_SEARCH_BASE< / span > < span class = "o" > =< / span > < span class = "s" > ou=users,dc=example,dc=org< / span >
< span class = "na" > SASLAUTHD_LDAP_FILTER< / span > < span class = "o" > =< / span > < span class = "s" > (& (uid=%U)(objectClass=inetOrgPerson))< / span >
< / code > < / pre > < / div >
< p > My LDAP data structure is very basic, containing only the username, password, and the external email address where to forward emails for this user. An entry looks like this< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > add uid< / span > < span class = "o" > =< / span > < span class = "s" > username,ou=users,dc=example,dc=org< / span >
< span class = "na" > uid< / span > < span class = "o" > :< / span > < span class = "s" > username< / span >
< span class = "na" > objectClass< / span > < span class = "o" > :< / span > < span class = "s" > inetOrgPerson< / span >
< span class = "na" > sn< / span > < span class = "o" > :< / span > < span class = "s" > username< / span >
< span class = "na" > cn< / span > < span class = "o" > :< / span > < span class = "s" > username< / span >
< span class = "na" > userPassword< / span > < span class = "o" > :< / span > < span class = "s" > {SSHA}abcdefghi123456789< / span >
< span class = "na" > email< / span > < span class = "o" > :< / span > < span class = "s" > real-email-address@external-domain.com< / span >
< / code > < / pre > < / div >
< p > This structure is different from what is expected/assumed from the configuration scripts of the mailserver, so it doesn't work just by using the < code > LDAP_QUERY_FILTER_...< / code > settings. Instead, I had to do < a href = "https://github.com/docker-mailserver/docker-mailserver/blob/master/README.md#custom-user-changes--patches" > custom configuration< / a > . I created the script < code > config/user-patches.sh< / code > , with a content like this:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "ch" > #!/bin/bash< / span >
rm -f /etc/postfix/< span class = "o" > {< / span > ldap-groups.cf,ldap-domains.cf< span class = "o" > }< / span >
postconf < span class = "se" > \< / span >
< span class = "s2" > " virtual_mailbox_domains = /etc/postfix/vhost" < / span > < span class = "se" > \< / span >
< span class = "s2" > " virtual_alias_maps = ldap:/etc/postfix/ldap-aliases.cf texthash:/etc/postfix/virtual" < / span > < span class = "se" > \< / span >
< span class = "s2" > " smtpd_sender_login_maps = ldap:/etc/postfix/ldap-users.cf" < / span >
sed -i /etc/postfix/ldap-users.cf < span class = "se" > \< / span >
-e < span class = "s1" > ' /query_filter/d' < / span > < span class = "se" > \< / span >
-e < span class = "s1" > ' /result_attribute/d' < / span > < span class = "se" > \< / span >
-e < span class = "s1" > ' /result_format/d' < / span >
cat < span class = "s" > < < EOF > > /etc/postfix/ldap-users.cf< / span >
< span class = "s" > query_filter = (uid=%u)< / span >
< span class = "s" > result_attribute = uid< / span >
< span class = "s" > result_format = %s@example.org< / span >
< span class = "s" > EOF< / span >
sed -i /etc/postfix/ldap-aliases.cf < span class = "se" > \< / span >
-e < span class = "s1" > ' /domain/d' < / span > < span class = "se" > \< / span >
-e < span class = "s1" > ' /query_filter/d' < / span > < span class = "se" > \< / span >
-e < span class = "s1" > ' /result_attribute/d' < / span >
cat < span class = "s" > < < EOF > > /etc/postfix/ldap-aliases.cf< / span >
< span class = "s" > domain = example.org< / span >
< span class = "s" > query_filter = (uid=%u)< / span >
< span class = "s" > result_attribute = mail< / span >
< span class = "s" > EOF< / span >
postfix reload
< / code > < / pre > < / div >
< p > You see that besides < code > query_filter< / code > , I had to customize as well < code > result_attribute< / code > and < code > result_format< / code > .< / p >
< div class = "admonition sealso" >
< p class = "admonition-title" > Sealso< / p >
< p > For more details about using LDAP see: < a href = "https://www.vennedey.net/resources/2-LDAP-managed-mail-server-with-Postfix-and-Dovecot-for-multiple-domains" > LDAP managed mail server with Postfix and Dovecot for multiple domains< / a > < / p >
< / div >
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< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
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< p > Another solution that serves as a forward-only mailserver is this: < a href = "https://gitlab.com/docker-scripts/postfix" > https://gitlab.com/docker-scripts/postfix< / a > < / p >
< / div >
< div class = "admonition tip" >
< p class = "admonition-title" > Tip< / p >
< p > One user reports only having success if < code > ENABLE_LDAP=0< / code > was set.< / p >
< / div >
< / article >
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