Hello Alessandro        

> -----Ursprüngliche Nachricht-----
> It is better to have a caching DNS almost dedicated to mail-related
> lookups, on the same or a nearby machine. You'll also use it for
> caching DNSBL replies (configure at least spamhaus.)

This is already done we have our own bind9 running which serv our
domains and is caching the DNSBL and more...

> If you have decent connections, you are probably better off without
> backup MXes, except for exceptional magnetic storms, e.g. the
> Carrington Event, that may result in network failures spread around
> the globe.

Our mails are to important as going without Backup-MX

Greetings
PMCOS




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