I'm in the process of migrating exchange 2010 to 2013 and since now we have a backup ISP I was wondering if ISP1 goes down and the server starts sending using ISP2 which is a different public IP if I have FQDN exch1.contoso.com with ISP1 and the servers
which receive emails from my server do revers DNS check on the second IP will see it doesn't correspond to exch1.contoso.com and will treat it as spam in most cases. Do I need to ask my ISP to add a PTR record with the same name for the IP used by my backup
ISP?
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