Re: [IMail Forum] DNS and backup mailserver

[Len Conrad]

>If a DNS server can't resolve the MX record for the primary mailhost (i.e.
>corrupted zone file), is it correct that the secondary mailhost (backup
>mailserver) will then not be used?


If the zone file's MX records are not obtainable at all (not primary, 
secondary MX) then the fall back is for the sendign MTA to try to 
deliver to the domain.com host.

But if a query for domain's MX records returns any MX record(s), the 
sending MTA will use them.

The "preference number" attached to an MX record is not an absolute 
number, but relative to the other MX records' preference number.  The 
smaller the preference number, the higher the priority.

Len

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