Ubuntu – Auto-configuring postfix using dpkg-set-selections

debianpostfixUbuntu

On Ubuntu 12.04, I'm trying to use dpkg-set-selections to automagically configure postfix on deployed machines with the following:

debconf-set-selections <<EOF
postfix postfix/main_mailer_type select Satellite system 
postfix postfix/root_address string admin@mydomain.org
postfix postfix/mailname string mydomain.org
postfix postfix/relayhost string gw.mydomain.internal
postfix postfix/destinations string $(hostname -f), localhost
EOF
DEBIAN_FRONTEND=noninteractive apt-get install postfix mailutils

Unfortunately, the configurator insists on adding mydomain.org to the postfix/destinations (aka mydestinations) config parameter:

postfix postfix/destinations    string  mydomain.org, myserver.mydomain.internal, localhost

How can I configure this properly? I want any unqualified mail to go out as user@mydomain.org and be relayed through the smarthost.

Best Answer

I think the problem is in the install scripts, postfix.preinst has some interesting code about it, and some comments:

Add a 'mydomain' entry in main.cf for upgrade? Postfix version 2.3.3-2 and later require changes in main.cf. Specifically, mydomain must be specified, since hostname(1) is not a fully qualified domain name (FQDN). . Failure to fix this will result in a broken mailer. Decline this option to abort the upgrade, giving you the opportunity to add this configuration yourself. Accept this option to automatically set mydomain based on the FQDN of the machine.*

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Postfix – How to Auto Create Maildir on Debian Email Server

The answer to this varies depending on how your Postfix system is configured. You mention pam and LDAP, so I assume you have all your domains in $mydestination, or you use only one domain (example.com, for instance)

It may be easier for you to configure virtual_mailbox_domains with LDAP maps instead of mysql/pgsql maps (the logic is exactly the same though).

You create a single system user, without login privileges. I shall assume a username and group of vmail:vmail here, but the specific name is not important.

In LDAP, create your mailbox path relative to $HOME for vmail (so the maildir becomes /home/vmail/user/Maildir/).

Add your domains to virtual_mailbox_domains. Create a virtual_mailbox_maps map which takes in the username as input and returns username/Maildir as output.

Set


virtual_mailbox_domains = example.com
virtual_mailbox_base = /home/vmail/
virtual_mailbox_maps = ldap:/etc/postfix/ldap_virtual.cf
virtual_uid_maps = static:$uid_of_vmail
virtual_gid_maps = static:$gid_of_vmail
#$uid_of_vmail and $gid_of_vmail are obtained from the output of 
#id vmail

in main.cf.

See http://www.postfix.org/ldap_table.5.html and http://www.postfix.org/VIRTUAL_README.html for more information (and what you need to put in ldap_virtual.cf).

FWIW, Postfix runs the local delivery process as the uid/gid of the system user you are delivering to.

The general permissions for /home are 755 with owner and group both root, but the user can write within ~user. Hence Postfix will happily deliver to ~user/Maildir/, but will not be able to create ~user. Using virtual users will sidestep this issue by granting access to all mailboxes to a single uid/gid, which is then accessed only by your pop3/imap software. Direct access to the mailbox by users will not be possible.

Debian – Automate Postfix instalaltion with debconf-set-selections

In my script I disable the interactive frontend first:
export DEBIAN_FRONTEND=noninteractive

Then I set al the preferences, f.e.:
postconf -e "mynetworks = 127.0.0.0/8, ${NETWORK_CIDR}"

You can then re-enable it by unsetting it:
unset DEBIAN_FRONTEND

Or, you can make it very easy by just running this command:
DEBIAN_FRONTEND=noninteractive apt-get install postfix-policyd

Best Answer

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Debian – Automate Postfix instalaltion with debconf-set-selections

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