On Thu, Nov 16, 2017 at 10:43:16PM +0000, Kevin Miller wrote:
> You can point the A record for aaa.com to one IP and the MX record 
> for it to another.

Yes, but not as per your example.

> I.e.
> aaa   IN A 192.168.1.1
>      IN MX 10 192.168.1.2

The RDATA for MX is "integer hostname".  In your example the 
"192.168.1.2" would be read as a hostname, and noting the lack of 
trailing dot, the zone file's current $ORIGIN value would be 
appended.

> In the example above, a web page to http://aaa.com would go to 
> 192.168.1.1, whereas an SMTP server would connect to 192.168.1.2.

In this example mail would most likely not be deliverable.  The MX 
record in DNS would point to a name which probably does not exist.
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