Re: [cobalt-developers] Mail Settings

[Jeff Lasman <jblists@xxxxxxxxxxxxx>]

All of us here wrote:

> >But you should only have ONE PTR record per IP#.  If you don't already
> >have a PTR record for the IP# on which this virtual site resides, then
> >you need to have one, and only one.  Personally, I recommend setting it
> >to the machine's canonical hostname and domain name.
> 
> I have many for each IP, that's the idea of virtual hosting

Many sites per IP#, yes.  Many PTR records per IP#, NO.

Do it yourself until you break something if you must, but please don't
recommend it to others.  It's wrong, it's dangerous.

> >A new MX record FOR www.domain.xxx will allow you to get mail for
> ><user@xxxxxxxxxxxxxx>.  Is that what you're talking about?  To get mail
> >addressed to <user@xxxxxxxxxx> what you need is an MX record for
> >domain.xxx, pointing to ANY A record for any domain, as long as that
> >domain's IP# is on the same RaQ.
> 
> Not true. Set only ONE MX record to www.domain.xxx and all mail to
> domain.xxx works just fine.

Still don't know what you mean by "to www.domain.xxx".  If you mean a
record like this:

domain.com   IN MX 30 www.domain.com

yes, that'll work, as long as there's an A record for www.domain.com. 
That's exactly what I wrote above.

But if you mean:

www.domain.com  IN MX 30 domain.com

or

www.domain.com  IN MX 30 www.domain.com

then the only reason mail to user@xxxxxxxxxx works is because so far
you've been using MTAs that will look up A records when they can't find
MX records.  But that's NOT an industry standard, and again, dangerous,
as many servers do NOT use A records for delivery when they can't find
MX records.

> See above, one MX record to www and everything else works.

As I've written, maybe you're agreeing with me and it's just a matter of
semantics.

Please be sure you're right when you pass information on mailing lists;
lots of people can learn bad habits that will eventually cause them
problems.

Thanks <smile>.

Jeff
-- 
Jeff Lasman <jblists@xxxxxxxxxxxxx>
nobaloney.net
P. O. Box 52672
Riverside, CA  92517
voice: (909) 787-8589  *  fax: (909) 782-0205