postfix
master branch: 
This is the postfix module. It provides installation and configuration routines using Puppet.
Simplest Configuration:
include postfix
It will just install the postfix package and ensure that postfix is running.
Simple Configuration:
include postfix
class { 'postfix::config':
smtpd_banner => 'example.org ESMTP example.org (Debian/GNU)',
}
It will just install the postfix package and ensure that postfix is running and set the SMTP Banner to the specified.
Relay Configuration:
include postfix
class {'postfix::relay':
sender_hostname=>'sender.example.org',
masquerade_domains=>'example.org',
relayhost=>'receiver.example.org'
}
It will just install the postfix package and ensure that postfix is running and that emails are forwarded to the relayhost.
Real World Configuration:
include postfix
class { 'postfix::postgres':
dbname => 'dbname',
dbpassword => 'dbpassword',
dbuser => 'dbusername',
}
class { 'postfix::config':
alias_maps => 'hash:/etc/aliases',
append_dot_mydomain => 'no',
biff => 'no',
broken_sasl_auth_clients => 'no',
content_filter => 'amavis:[127.0.0.1]:10024',
disable_vrfy_command => 'yes',
import_environment => 'MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY DISPLAY LANG=C RESOLV_MULTI=on',
mail_spool_directory => '/var/mail',
mailbox_size_limit => '100000000',
message_size_limit => '60485760',
mydestination => 'mail.example.org, localhost, localhost.localdomain',
myhostname => 'mail.example.org',
mynetworks => '127.0.0.0/8, 192.168.122.0/24',
myorigin => '/etc/mailname',
local_recipient_maps => 'proxy:unix:passwd.byname $alias_maps',
proxy_read_maps => '$local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks',
receive_override_options => 'no_address_mappings',
show_user_unknown_table_name => 'no',
smtp_sasl_security_options => 'yes',
smtp_tls_CAfile => '/etc/ssl/certs/CAcert_chain.pem',
smtp_tls_note_starttls_offer => 'yes',
smtp_use_tls => 'yes',
smtpd_banner => 'example.org ESMTP example.org (Debian/GNU)',
smtpd_data_restrictions => 'reject_unauth_pipelining, permit',
smtpd_delay_reject => 'yes',
smtpd_helo_required => 'yes',
smtpd_recipient_restrictions => 'reject_invalid_hostname, permit_sasl_authenticated, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, reject_unauth_destination, reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net permit',
smtpd_sasl_auth_enable => 'yes',
smtpd_sasl_local_domain => '$myhostname',
smtpd_sasl_security_options => 'noanonymous',
smtpd_sender_restrictions => 'permit_sasl_authenticated, permit_mynetworks',
smtpd_tls_auth_only => 'no',
smtpd_tls_cert_file => '/etc/ssl/certs/example_server.pem',
smtpd_tls_key_file => '/etc/ssl/private/example_privatekey.pem',
smtpd_tls_loglevel => '1',
smtpd_tls_received_header => 'yes',
smtpd_tls_session_cache_timeout => '3600s',
smtpd_use_tls => 'yes',
tls_random_source => 'dev:/dev/urandom',
transport_maps => 'proxy:pgsql:/etc/postfix/postgresql/virtual_transports.cf',
virtual_alias_maps => 'proxy:pgsql:/etc/postfix/postgresql/virtual_forwardings.cf',
virtual_gid_maps => 'static:5000',
virtual_mailbox_base => '/srv/vmail',
virtual_mailbox_domains => 'proxy:pgsql:/etc/postfix/postgresql/virtual_domains.cf',
virtual_mailbox_limit => '100000000',
virtual_mailbox_maps => 'proxy:pgsql:/etc/postfix/postgresql/virtual_mailboxes.cf',
virtual_uid_maps => 'static:5000',
smtpd_sasl_type => 'dovecot',
smtpd_sasl_path => 'private/auth',
virtual_transport => 'dovecot',
dovecot_destination_recipient_limit => '1',
maildrop_destination_recipient_limit => '1',
}
Well, it does something more. You could reuse this piece of code but you need to have a dovecot running and a database with the correct schema.