problem with MX-record

[Suvicha Jaroensuk]

Dear sir,
	Thank you. I might make you confuse about my misconfiguration.
	Mail Exchanger for domain.1
	domain.1   IN 5  X.domain.1	Cw domain.1
		   IN 10 Z.domain.2     Cw domain.2 
	but
		Z.domain.2 IN A 1.1.1.1 ( its name = mail1.domain.2 )
		Z.domain.2 IN A 2.2.2.2 ( its name = mail2.domain.2 )
		Z.domain.2 is  Mail Exchanger for domain.2 by mail
		be switched to between mail1 and mail2 ( Cw domain.2 )
	
	My assumption is when X.domain.1 is out of order, mail for
domain.1 will forward to Z.domain.2 for relaying ,it might be  mail1 or
mail2. When mail is trying back to X.domain.1 , if X.domain.1 is still
out of order, mail1 or mail2 will compare ifself to Z.domain.2 ,its result
is not the same name ( I am not sure about preference value) ,so mail will
be forward to Z.domain.2 again ( Loop back result ).

> In recent versions of sendmail you can add Z to the Cw list of themachine
> and it will treat that as an alternate name for itself when performing the
> MX record comparisons.
	
	you mean that we can put Z.domain.2 to "Cw" on mail1 and mail2 for
performing the MX record comparisons.

Have any suggestions

TIA
suvicha

On Tue, 29 Jun 1999, Barry Margolin wrote:

> In article <Pine.LNX.3.96.990629111915.17190B-100000 at lox2.loxinfo.co.th>,
> Suvicha Jaroensuk  <suvij at lox2.loxinfo.co.th> wrote:
> >Dear sir,
> >	How do you configure your MX record and use round robin ?
> >I got the same problem. I guess that I used round robin host to be second
> >MX for other domains. For example :
> >	X IN 5 Y.domain
> >	Z IN 10 Y.domain
> >but
> >	Z IN A 2.2.2.2
> >	Z IN A 1.1.1.1
> >
> >If X is down for any reasons, mail for Y.domain will go to Z , but I don't
> 
> You have your records backward.  It should be:
> 
> Y IN MX 5 X
> Y IN MX 10 Z
> 
> >know which host that e-mail will forward to between 2.2.2.2 or 1.1.1.1 for
> >mail queue keeping. According to sendmail features, mail queue will try to
> >send that mail going out to X, if X  still fails so it will be send to Z
> >again without comparison preference value because Z is not the same name
> >as ifself.
> 
> I don't understand.  If the mail gets to 2.2.2.2 or 1.1.1.1, that machine's
> name should be Z, so it should ignore those MX records.
> 
> 
> -- 
> Barry Margolin, barmar at bbnplanet.com
> GTE Internetworking, Powered by BBN, Burlington, MA
> *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
> Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
>