Postfix mailer configuration
Postfix mailer configuration __ _ -o)/ / (_)__ __ ____ __ Derek Winterstien /\\ /__/ / _ \/ // /\ \/ / r.o.a.c.h.@.r.o.b.o.t.z...c.o.m _\_v __/_/_//_/\_,_/ /_/\_\ Trustix Secure Linux ..............................................................................
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
Contents
Hosting Domains
- . canonical hostname and/or domain of machine
- . virtual alias domain virtual domain uses unix passwd system accounts
- . virtual mailbox domain virtual domain and independent accounts
Configuration: mailbox format
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
Edit main.cf
myorigin mydestination mynetworks_style ignord if mynetworks list specified mynetworks you can specify a plain text file to contain valid
Example a10: mynetworks
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
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
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
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.
