Re: [exim] End of the DNS MX record ?

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Author: Jasen Betts
To: exim-users
Subject: Re: [exim] End of the DNS MX record ?
On 2014-09-02, Always Learning <exim@???> wrote:
> On Tue, 2014-09-02 at 10:50 -0400, Chris Siebenmann wrote:
>> They aren't redundant but they aren't necessary. The standard is that
>> you try the A record[*] if there is no MX record.
>> (This behavior is actually sometimes annoying, because it means that
>> there is no clean standards-compliant way of saying 'this machine exists
>> but you should never attempt mail delivery to it'. People often use
>> various bogus MX values for this purpose, like 'MX localhost.' or 'MX
>> .'.)
> Away goes my latest quick check ............
>    condition   = ${lookup dnsdb{mxh=${domain:$sender_address}}{0}{1}}

> Just simple checks can significantly reduce spam, provided everyone
> creates MX records.

yeah, The best you can do is "Verify = sender"

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