loadbalancing MX records

José M. Fandiño jm.fandino at fadesa.es
Thu Aug 31 12:18:52 UTC 2000


Hello,

thanks for the reply. This isn't my problem, tsai.es is an
ISP and I'm trying to see what will occur if my MTA sends a
msg. to mail.infomail.tsai.es. I get several ip's and 
suppose 194.224.53.134, 194.224.53.135 and 194.224.53.142 
is down. The preference is not applied, correct?
will I get an undelivery msg. or the MTA will go on until 
195.235.39.6 (the last one)?

hermann.strassner at hama.de wrote:
> 
> With your kind of load balancing it is up to the MTA to decide
> which mail server to use=2E The remote MTA is normally not
> under your control, so you have no influence on load balancing=2E
> 
> With the former kind of load balancing it is up to the name
> server to decide which ip address to give, so which mail server
> to use, and the name server for a zone is normally under the
> same control as the mail servers=2E
> 
> You should install a mail relay with lower priority for security
> and backup purposes=2E
> 
> Hermann

> >I'm curious about this form of loadbalancing for
> >mail (MX):
>
> >;; ANSWERS:
> >tsai.es.        115493  MX      100 mail.infomail.tsai.es.
> >
> >;; ADDITIONAL RECORDS:
> >mail.infomail.tsai.es.  106522  A       194.224.53.134
> >mail.infomail.tsai.es.  106522  A       194.224.53.135
> >mail.infomail.tsai.es.  106522  A       194.224.53.142
> >mail.infomail.tsai.es.  106522  A       195.235.39.6
> >
> >if any "mail.infomail.tsai.es" host fail the message
> >will be lost?
> >
> >is not better multiple MX definitions with equal preference?  

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