Hi all,
# uname -a
FreeBSD 9.3-RELEASE-p13 FreeBSD 9.3-RELEASE-p13 #0: Tue Apr 7 03:01:12 UTC 2015
# postconf mail_version
mail_version = 2.11.5
I have a couple of servers setup to relay mail from customers.
Relay access to control by IP address using mynetworks parameter and a MySQL
backup.
# postconf mynetworks
mynetworks = proxy:mysql:/usr/local/etc/postfix/mysql/mynetworks.cf
#cat /usr/local/etc/postfix/mysql/mynetworks.cf
user = some_user
password = some_pass
dbname = mail
query = SELECT '%s' as ip FROM postfix_mynetworks WHERE INET_ATON('%s') BETWEEN
ip_start_aton AND ip_end_aton AND active='y' /* mynetworks.cf */;
hosts = mysqlserverhost
This setup has works reasonable for years, but we do occasionaly run into
problems if an end user setups mail forwarding on thier mailbox to thier
personal hotmail or outlook.com address. This results in us getting blacklisted
by Microsoft (one problem is that forwarding breaks SPF, another problem the
user occasional forwards thier spam).
Being listed in mynetworks means my customers can sender email from
anydomaintheylike.com via our servers.
Is there a way for me to configure postfix to permit IP 1.2.3.4 to relay only
mail addressed from example1234.com, and IP 2.3.4.5 to relay only mail
addressed from example2345.com and so on and so forth? I appericate this
wouldn't be full proof, but it would serve a purpose in my setup.
Kind regards
Steve
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