In the GWIA settings under SMTP/MIME, the "Relay Host for outbound messages" we have the address for a Cisco Ironport c170 that filters our messages.
We want to add another Ironport for failover. If I add a second IP, can this be prioritized so the 2nd unit will only be used if the 1st is down?
What logic will/might be used when a second relay host is used?
Am I approaching this right or should I plan to let it send from either relay host?
Thank you for any help you can offer.