I am running a Postfix mail server. Some domains are configured that the DNS
MX record is set to an antispam service. This service is forwarding the good mails to our mailserver. Some sender are ignoring the
MX entry so they send the mails (most spam) directly to the postfix server.
So I tested some configuration changes on the Postfix server, that when an emails goes to the specified domains to check which ip sends this email. If it is an ip from the antispam service to accept the mail, all other ips reject the mail.
As reference I took these two sites to configure the postfix mailserver: Postfix Limit mail for domain from IP range and http://www.postfix.org/RESTRICTION_CLASS_README.html
When I test my configuration, i see that the part with the domains is working. But my problem is, all incoming mails for the specified domains are rejected, no email will be accepted, although the ip i send with is allowed.
So here is my Postfix configuration.
smtpd_restriction_classes = antispam antispam = check_sender_access texthash:/etc/postfix/allowed_ips, reject smtpd_recipient_restrictions = [... other restrictions ...] check_recipient_access texthash:/etc/postfix/protected_domains, permit
192.0.2.0/24 PERMIT 198.51.100.4/32 PERMIT 0.0.0.0/0 REJECT
domain.example antispam domain2.example antispam