Postfix: “hostname x does not resolve to address y” warning even though it does

domain-name-systemmulti-homedpostfix

Postfix log shows lots of these:

warning: hostname client.lab.lan does not resolve to address 192.168.1.153

Yet a DNS lookup from the server shows that it does resolve:

# nslookup client.lab.lan
Server:         192.168.10.242
Address:        192.168.10.242#53

Name:   client.lab.lan
Address: 192.168.1.153
Name:   client.lab.lan
Address: 192.168.10.4

I'm assuming it has something to do with the multiple A records, but no idea how to fix it.

Any hints on how to just disable that warning would be appreciated too.

Best Answer

The fact that there are multiple A records means that you have a roughly 50% chance of getting one or the other. You can either (a) remove one of the A records or (b) create the appropriate PTR records so that both addresses reverse to the correct value.

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