Domain of sender address ... does not exist

[Philip A. Prindeville]

On 12/11/2009 01:24 PM, John Aldrich wrote:
> On Friday 11 December 2009, Tim wrote:
>   
>> On Fri, 2009-12-11 at 06:08 -0500, John Aldrich wrote:
>>     
>>> Sounds like there may be no "A" record for redfish-solutions.com.
>>>       
>> There definitely wasn't, here.  But the original poster didn't state
>> whether there should be public records for the domain.  "External" could
>> just been another network they work with.
>>
>>     
> Even if there's no website, there needs to be an "A" record. Since it's a 
> valid domain. I would guess they're trying to set up an email-only domain 
> and some mail servers don't like that. Just leave the "parked" website up 
> and running at your registrar and that might work. OTOH, you might still 
> need to put up a generic "under construction" website to fool the spam-
> checkers so that the A record and the MX record match.
>   

Why would I need an A record?  All mailers should support MXing, right?

As long as my MX points to a name that has a valid A record, I should be golden.