[Mimedefang] OT: Re: Many many MX records

[Tim Pushor]

Yes, it should fall back to TCP if the query size is too large, but you 
would be surprised at how many networking 'professionals' there are out 
there blocking TCP port 53 because all it is used for is zone transfers..

Stephen Smoogen wrote:

>I thought recent versions of DNS will fall over to TCP if the packet
>grows larger than XYZ UDP length. That being the case, I dont think it
>is recommended to have more than 3-5 MX records per hosts. I think the
>reasons are usually legend versus factual, but that is the 'normal' way
>of doing it. 
>
>
>  
>