On 2023-04-18 12:49, Viktor Dukhovni via Postfix-users wrote:
On Tue, Apr 18, 2023 at 10:35:22AM +0800, tom--- via Postfix-users
wrote:
So my question is, smtp code 450 will cause the sender to retry
delivery
to secondary MX?
Yes, if the client is a legitimate MTA, less common with a
Note that reject_unknown_client_hostname is a very strict test that is
likely to reject legit mail. Consider using
reject_unknown_reverse_client_hostname instead.
Do you know where I can set the action code 550 for this directive?
Thanks.
On Tue, Apr 18, 2023 at 10:35:22AM +0800, tom--- via Postfix-users wrote:
> So my question is, smtp code 450 will cause the sender to retry delivery
> to secondary MX?
Yes, if the client is a legitimate MTA, less common with a junk-sending
botnet. Once you're confident your restriction
On 4/17/2023 9:35 PM, tom--- via Postfix-users wrote:
When my main postfix rejected a message due to
reject_unknown_client_hostname:
Apr 18 10:27:12 mail postfix/smtpd[129429]: NOQUEUE: reject: RCPT
from unknown[194.33.39.17]: 450 4.7.25 Client host rejected: cannot
find your hostname,
