[lug] MX records in DNS

[rm at fabula.de]

On Wed, Dec 19, 2001 at 04:41:43PM -0700, cody at neosolv.net wrote:
> 
> > In your DNS record, I do see one discrepancy....don't know it is exactly a
> > problem, but possibly.  Usually, the MX record priority is a number above
> > zero, normally an multiple of 10.  This simply allows for flexibility in
> > future changes.  For instance,  my MX records for one domain:
> 
> Again from the book: "The preference value is an unsigned 16-bit number 
> (between 0 and 65535) that indicates the mail exchanger's priority."
> 
> So zero won't break anything, but I agree, it is much more typical and 
> flexible to see something like 10 as a base preference.

Yes, by the specs you are certainly right, but it's up to the
MTA client making the DNS request to interprete the MX records
preference value.  IMHO i think it's way too likely that some
broken client will cough on a zero preference value ....
I recall a problem we had a few years ago with an MS based POP
mailer (NT-Mail if memory serves me right) that got the pop
RFC all wrong (missinterpreted the return value of the LAST
command) and allways left one mail on the server ;-)

 Ralf Mattes

> 
> cody
> 
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