239215Re: compensating for cellphone company's misconfigurations
- May 31, 2008On Sat, May 31, 2008 at 10:50:53AM -0400, Postfix Mail System wrote:
> May 31 09:39:26 helix postfix/smtpd: NOQUEUE: reject: RCPT fromYes, mm.att.com exists, but mm.att.net does not. Perhaps they meant mm.att.com,
> atlmtaow01.cingularme.com[18.104.22.168]: 450 <5185551234@...>:
> Sender address rejected: Domain not found; from=<5185551234@...>
> to=<baby@...> proto=ESMTP helo=<atlmtaow01.cingularme.com>
> If I am interpreting the logs correctly, postfix is properly rejecting due
> to the hostname mm.att.net not resolving:
but botched the extension.
> I would like to compensate for this by whitelisting them on some level orIf you are running a local BIND caching dns server on your system, you
> another. I am looking for some thoughts on the best method/strategy to do
could help them out by creating a private authoritative mm.att.net zone,
and setting its MX records to point at those of mm.att.com...
But, it may be better to reach out to their postmaster...
> smtpd_recipient_restrictions =Start with:
> # check_client_access hash:/usr/local/etc/postfix/pop-before-smtp,
> # permit_sasl_authenticated,
Only then add
and directly above it add a "check_sender_access ..." that handles
exceptions, note you will whitelist these sender domains from all other
checks that follow unless you resolve to a restriction class that does
all the other checks, except unknown sender domain. THis is complex. I
reject unknown sender domains in the *data* restrictions. The BIND
solution is actually cleaner in some ways, but resolving the issue with
their postmaster is better still.
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