Regarding PTR records for mail gateways and ZoneRunner...
I have a question regarding reverse lookups (and by extension SPF records) for mail gateways in an F5 GTM\LTM deployment scenario.
We have decided to implement 2 F5 load balancers in a pool in order to load balance 2 ISP links for our organization. These load balancers will be sitting outside our Firewall and basically be load balancing traffic passed through the firewall out our 2 ISP links in a round-robin configuration. In conjunction, we have decided to move our external dns from being hosted on Godaddy to the F5 devices using Zonerunner. We have all our records configured and have tested everything, but we have some concerns regarding reverse lookups for our mail gateways that we would like to get some assistance on before we go through with our full implementation. We are concerned specifically about these lookups as we do not want outgoing mail to be rejected by other domains.
Performing an mxlookup of our current records tells us that our PTR records for our mail gateways are correctly pointing to our mail gateways on ISP link 1, and we assume that we simply have to have the ISP update the records for the secondary link to point to the same gateways. However, we are unsure if this the only change we have to make or if we are required to add the PTR records for the gateways into Zonerunner. Our research hasn't yielded a concrete answer to this question, and we would like to avoid spending our implementation window scrambling to resolve an outage related to this. Is there anyone who can provide some insight on this issue?