iRedMail server cannot resolve mail domain name "host2".
You can try one of below:
- add it in /etc/hosts and /var/spool/postfix/etc/hosts
- if you have an internal dns server, make this domain name resolvable in this internal dns server.
- add ip of this server in Postfix parameter "mynetworks =" directly
The host names resolve I checked them from the mail server. the local DNS server is the primary (caching) DNS server for everyone. it's rejecting (I'm pretty sure) because they are are sending from another domain.
I reconfigured postifx on one of the rejected clients to use the new mail server directly. now it is getting rejected with "sender address rejected: Domain not found;" so it has changed slightly. The host name/Ip address are recorded int he same log line immediately prior to this, so I know name resolution is working.
Most of these systems are set up sending emaisl from monitoring scripts, so they use the hostname as the 'from" address. Does this mean I either have to remove all sender restriction inside the domain or set up an account for every host that send a scripted email?
I this a throttling issue ?
statistics: max connection rate 1/60s for (smtpd:192.168.20.23)