Avantguard Computer & Security Systems

Postfix Config Files

/etc/postfix/access

The access table controls which senders/recipients/hosts are permitted or rejected.

Format: pattern action

# Permit specific domains
example.com         OK
.example.com        OK

# Reject specific addresses
spammer@evil.com    REJECT
@spammerdomain.com  REJECT

# Reject with custom message
badguy@example.com  550 Blocked

# Permit local network
192.168.1           OK
10.0.0              OK

After editing, rebuild the hash map:

postmap /etc/postfix/access
postfix reload

/etc/postfix/main.cf Key Settings

# Basic identity
myhostname = mail.example.com
mydomain = example.com
myorigin = $mydomain
inet_interfaces = all
inet_protocols = ipv4

# Relay configuration
mynetworks = 127.0.0.0/8, 192.168.1.0/24
mydestination = $myhostname, localhost.$mydomain, $mydomain
relayhost =

# Mailbox format
home_mailbox = Maildir/
mailbox_size_limit = 0
message_size_limit = 52428800

# Restrictions
smtpd_helo_required = yes
smtpd_recipient_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_unauth_destination,
    check_sender_access hash:/etc/postfix/access,
    reject_rbl_client zen.spamhaus.org,
    reject_rbl_client bl.spamcop.net,
    permit

/etc/postfix/virtual

Maps email addresses to local users:

# /etc/postfix/virtual
info@example.com    localuser
admin@example.com   localuser
@catchall.com       localuser

postmap /etc/postfix/virtual

Add to main.cf:

virtual_alias_maps = hash:/etc/postfix/virtual