Tobi wrote:
Am 30.05.2018 um 17:35 schrieb Per Jessen:
Okay, thanks for clarifying that - I was wondering. I don't why my postfixes come up with host name 'unknown'.
afaik postfix logs "unknown" as well if it is not a FcrRDNS means the hostname retrieved from a PTR query should forward resolve again to the ip address.
Yes, that is correct. Provided postfix works with a PTR with a CNAME, that bit is okay.