On 2017-03-09 13:06, Noel Jones wrote:
On 3/9/2017 2:58 PM, MRob wrote:
Hello, in Postfix v3.1 I'm having a hard time getting
reject_unknown_client_hostname to bounce test messages.
See the docs for what this rejects.
http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname
Warning: this is a very strict test likely to reject legit mail.
I'm aware of that, but wanted to test it and see how we did. Definitely,
anecdotes about what type of mail will be rejected are appreciated.
See also: FCrDNS
I set an external host's Postfix myhostname to be purposefully
incorrect, like nosuchhost.example.com and sent a message to the
test system. If I have reject_unknown_helo_hostname enabled, it will
reject such messages. But reject_unknown_client_hostname won't, I
don't understand why.
Settings in postfix do not control the client hostname; the client
hostname is set in DNS.
Yes, that's for the address->name mapping part of the check. Isn't the
hostname for the name->address mapping part of the check obtained by
HELO? Is there something in the tcp connection that identifies the
hostname? Sorry if I misunderstood this part.
