On Fri, May 24, 2013 at 12:24:26AM +0800, Joe Wong wrote:

> Is there a config to tell posfix , to retry a email under A: host not found
> condition?

Why?  When a destination domain does not exist, why keep the mail
in the queue 5 days in the almost always futile hope that it may
come to exist soon?

When a destination has MX records, but none of the MX hosts resolve to
an address, you can (though this too is IMHO unwise), choose the defer
the message:

        smtp_defer_if_no_mx_address_found = yes

This does not apply when there are no MX records (either NXDOMAIN or
NODATA for both MX and A/AAAA records).

-- 
        Viktor.

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