Postfix mailer configuration
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-o)/ / (_)__ __ ____ __ Derek Winterstien
/\\ /__/ / _ \/ // /\ \/ / r.o.a.c.h.@.r.o.b.o.t.z...c.o.m
_\_v __/_/_//_/\_,_/ /_/\_\ Trustix Secure Linux
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Postfix should be configured to start up on boot
chkconfig Postfix on
Make some configuration changes in postfix
vi /etc/postfix/main.cf
Add / Modify the following
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, $mydomain
myorigin = $mydomain
Logs: (var/log/mail)
debug
errors
info - mail delivery attempts
notice
warnings - such as hostname verification
Hosting Domains
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1. canonical hostname and/or domain of machine
2. virtual alias domain virtual domain uses unix passwd system
accounts
3. virtual mailbox domain virtual domain and independent accounts
Configuration: mailbox format
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Choose a mailbox format. This guide will cover mbox as opposed to MailDir.
#!! home_mailbox = Mailbox <- delete or remark out this line. Do not specify
the home_mailbox parameter for mbox style delivery.
mail_spool_directory = /var/spool/mail
Configuration: main.cf
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Edit main.cf
myorigin
mydestination
mynetworks_style ignord if mynetworks list specified
mynetworks you can specify a plain text file to contain valid
relays (ex a10)
virtual_alias_domains you can specify a plain text file containing hosted
virtual domains
virtual_alias_maps equiv to virtusertable in sendmail, cannot be plain
text file (ex a20)
Example a10: mynetworks
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You can list the relays in the main.cf file:
mynetworks = 168.100.189.0/28, 127.0.0.0/8
Or refer to a hash file:
mynetworks = hash:/etc/postfix/relay_table
Or a flat text file:
mynetworks = /etc/postfix/relay_table
In the flat text file, # comments a line, an IP specifies a single host
allowed relay. The sendmail format of a partial IP, X.X.X does NOT work. To
specify a network use network metrics X.X.X.X/24
Example a20: virtual_alias_maps
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You can specify a hash table file for virtual_alias_maps, which is simular to
sendmail's 'virtusertable' file with one important difference: postfix virtual
domains do not automatically map to unix system accounts.
Specify in main.cf:
virtual_alias_maps = hash:/etc/postfix/virtusers
Format:
username@virtualdomain.com unixmailbox
Hash it:
postmap virtusers
Explained:
The addess username@virtualdomain.com will be directed to the unix system
mailbox named unixmailbox.
Postfix Lookup Table Types: type:name
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Not all of them, but on Linux here are a few important ones...
regexp regular expressions lookup table
hash standard hash index file
sdbm sdbm supported hash index file
pcre perl style regular expressions table
Virtual Mailbox Domains and Non-UNIX Accounts
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You must use a pop or imap server that is compatible with every recipient
address having its own virtual mailbox. For example, popa3d is a great pop
server known for simplicity and security, but it will not recognize your
virtual, non system mailboxes.
Graylisting and spamd
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http://www.elwood.net/greyspamd.html
http://www.greylisting.org/implementations/postfix.shtml