i've seen this asked differently in this forum so here goes my question...
i know that a severe limitation is that the SMTP proxy can only be configured with a single hostname.
my situation is that i have multiple ISPs with a single exchange server, using the UTM SMTP proxy, right now it's set on a single IP/MX/hostname.
Thing isis that we want output AND input redundancy(not so much load balance) and that configuration issue is probing to be problematic.
so this is my idea to implement it:
- on the existing A record (to which the MX points) add all the IPs i need
- update SPF records with said IPs
- modify MP rules to allow outgoing SMTP through those IPs only
- ask ISPs to set the RDNS of those IP to point to the same A record
would this work?
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