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Wez Furlong
4917ee6245
Saw an MX record that expands to 0.0.0.0 in the wild. As well as being nonsense, that causes a mail loop, so we should add it to prohibited_hosts. I noticed that we also did not document its default value, so the doc update here shows the before and after for this.
641 B
641 B
prohibited_hosts
A CIDR list of hosts that should be considered "poisonous", for example, because they might cause a mail loop.
When resolving the hosts for the destination MX, if any of the hosts are
present in the prohibited_hosts list then the ready queue will be immediately
failed with a 550 5.4.4 status.
The default value for this is:
127.0.0.0/8, the set of IPv4 loopback addresses::1, the IPv6 loopback address
{{since('dev')}}
The default value is now:
127.0.0.0/8, the set of IPv4 loopback addresses0.0.0.0, the IPv4 Any address::1, the IPv6 loopback address::, the IPv6 Any address