On Wed, 23 Feb 2011 08:44:45 -0500, dar...@chaosreigns.com wrote:
On 02/23, Michael Scheidell wrote:
>http://tools.ietf.org/html/draft-delany-nullmx-00
>
read the rfc again. missing mx is not NULL mx.
Also, that's a *draft*, not an accepted standard.
And I'm curious if you are asking the question you mean to. What
exactly
is the way postfix checks this? Specifically, I'm wondering if
you're
referring to reject_unknown_client, which I've used for years, and
which
does not use MX addresses.
I don't know of an option to reject an email because the sending
domain
has no MX record. As has been said, the standards require then
delivering
email to the A record for the domain. I don't know how common this
is
among legit mail servers, but I've certainly seen it.
I think the function of the null MX idea is provided by SPF?
The syntax for the DNS check in Postix is reject_unknown_sender_domain
in smtpd_sender_restrictions!
Cheers,
Henry
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