From: Aaron Rogge (aaronunionaires.org)
Date: Sun Apr 25 2004 - 12:26:28 CDT

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I am wanting to prevent emails being sent that appear to come from my
domain(s) but are invalid addresses. I am willing to accept emails that
appear to be sent from a valid user.

Configuration:

multiple virtual domains
authenticate senders using pop-before-smtp, I know I should use SASL but
haven't gotten around to configuring it and this is easier for my users.

Here is my main.cf:

command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
myhostname = mail.ajrogge.com
myorigin = $mydomain
inet_interfaces = all
mydestination = localhost.$mydomain, localhost
mynetworks_style = host
alias_maps = hash:/etc/postfix/aliases, hash:/var/mailman/data/aliases
recipient_delimiter = +
home_mailbox = Maildir/
mail_spool_directory = /var/virtual
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-1.1.12/samples
readme_directory = /usr/share/doc/postfix-1.1.12/README_FILES
alias_database = hash:/etc/postfix/aliases
queue_directory = /var/spool/postfix
mail_owner = postfix
unknown_local_recipient_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf,
hash:/var/mailman/data/virtual-mailman
virtual_gid_maps = static:89
virtual_mailbox_base = /var/virtual/
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 89
virtual_transport = virtual:
virtual_uid_maps = static:89
disable_vrfy_command = yes
owner_request_special = no
smtpd_recipient_limit = 100
smtpd_recipient_restrictions =
       permit_mynetworks,
       check_client_access hash:/etc/postfix/pop-before-smtp,
       reject_unknown_recipient_domain,
       reject_non_fqdn_recipient,
       reject_non_fqdn_sender,
       reject_unauth_destination,
       reject_invalid_hostname,
       reject_unknown_sender_domain,
       reject_rbl_client bl.spamcop.net,
       reject_rhsbl_client blackhole.securitysage.com,
       reject_rhsbl_sender blackhole.securitysage.com
       reject_rbl_client relays.ord.org,
content_filter=spamfilter

Thank you for your help,
aaron

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