Basic Postfix Setup

Below is a snippet which goes in your /etc/mail/main.cf file. This implements a good starting foundation for any of the specialized configurations specified in this section.

1. Set myhostname to the FQDN of your server. For example myhostname=myserver.example.com

2. Add the following to your /etc/mail/main.cf file

# Allow only ourselves as mynetworks
mynetworks=127.0.0.1

# This disables the vrfy command which can be used by spammers to verify if an email addy exists
disable_vrfy_command=yes

# Be more strict about how many errors we can get before we give up on the client
smtpd_soft_error_limit=5
smtpd_hard_error_limit=10

smtpd_data_restrictions=
                reject_multi_recipient_bounce,
                reject_unauth_pipelining

smtpd_etrn_restrictions=
                permit_mynetworks,
                reject

# Require sending server helo to us
smtpd_helo_required=yes

smtpd_recipient_restrictions=
                reject_non_fqdn_recipient,
                reject_unknown_recipient_domain,
                permit_mynetworks,
                reject_invalid_hostname,
                reject_non_fqdn_hostname,
                reject_unauth_destination

smtpd_sender_restrictions=
                reject_non_fqdn_sender,
                reject_unknown_sender_domain

# Make sure envelope addies contain  <>
strict_rfc821_envelopes=yes

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