(原創)某domain(域名) 只收來自某IP的email

freebsd+postfix+postfixadmin:
vi /usr/local/etc/postfix/main.cf
mynetworks = 10.2.91.88/32

smtpd_restriction_classes = your-domain.com
your-domain.com = permit_mynetworks,reject

smtpd_sender_restrictions = check_recipient_access mysql:/usr/local/etc/postfix/mysql_virtual_alias_recipient_maps.cf

vi /usr/local/etc/postfix/mysql_virtual_alias_recipient_maps.cf
user = postfix
password = postfix
hosts = localhost
dbname = postfix
table = alias
select_field = domain
where_field = address
additional_conditions = and domain = 'your-domain.com'

/usr/local/etc/rc.d/postfix reload


linux+qmail+vpopmail:
vi rcpthosts
delete your-domain.com

vi /etc/tcp.smtp
10.2.91.88:allow,RELAYCLIENT=""

qmailctl cdb