[Mimedefang] Many many MX records

[David F. Skoll]

On Tue, 13 Jan 2004 WBrown at e1b.org wrote:

> This led me to wonder  what would happen if I registered a bunch of high
> valued MX records, ie:

> Domain.com      IN MX 10        mailfilter.domain.com

> Domain.com      IN MX 100       bogusaddress.domain.com
>                 .
>                 .
> Domain.com      IN MX 200       bogusaddress.domain.com

I wouldn't recommend doing this.  DNS uses UDP, and it's inadvisable to
have so many MX records that they won't fit in one decent-sized UDP packet.
It will cause a lot of load on your DNS server, and I bet will trigger
weird bugs in a lot of resolver libraries out there.

It would also hurt legitimate senders, especially ones that aren't smart
enough to discard duplicate MX records.

Regards,

David.