On Fri, Apr 26, 2013 at 01:39:19PM +0800, Feel Zhou wrote:
> Apr 25 10:02:24 shcx postfix/smtpd[21741]: NOQUEUE: reject: RCPT from
> mail.example.com[d.d.d.d]: 450 4.1.2 <[email protected]>: Recipient
> address rejected: Domain not found; from=<[email protected]> to=<
> [email protected]> proto=ESMTP helo=<mail.example.com>
>
> dig sino-progress.com mx
> sino-progress.com. 40 IN MX 10
> qiye163mx01.mxmail.netease.com.
> sino-progress.com. 40 IN MX 50
> qiye163mx02.mxmail.netease.com.
> This domain already exist, why noqueue
Always with a new thread:
http://www.postfix.org/DEBUG_README.html#mail
Best guess given scant information:
http://www.postfix.org/postconf.5.html#reject_unknown_recipient_domain
... The response is always 450 in case of a temporary DNS error. ...
Best practice for most sites:
Don't use reject_unknown_recipient_domain.
Note for this restriction to pass not only do the MX records have to
resolve, but the MX hosts have to resolve to network addresses. Any
of this can tempfail.
--
Viktor.
