MX records

[thomasschwinn at st-service.net]

What's the difference between this MX records?

a-m-t.net.       IN  MX  10  212.172.100.164   ; GLOBALOK
a-m-t.net.       IN  MX  20  212.172.100.164   ; GLOBALOK
a-m-t.net.       IN  MX  100 212.172.100.164   ; GLOBALOK

and what's the difference between GOLBAOK and EXTREF?

Thanks for your help

Thomas Schwinn


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