SMTP Relay Whitelist
Dears,
I need help in the following case, We have implemented F5 LTM in SNAT mode to load balance SMTP traffic for Exchange servers 2016.
The exchange servers administrators are facing an issue with the SMTP relay whitle-list because the SMTP relay cant see the client IP addresses anymore, all SMTP traffic is coming from the Bigip address.
i have understood that we can change the NW design by making the LTM is the Gateway of the Exchange servers or we can add an IRule to filter the IP addresses but i was seeking a workaround to rewrite the client original address in the SMTP header or the connection (Same as the HTTP x-forward) so the SMTP relay can do the white-list filtering?
Please let me know if there is any IRule or workaround that can do the trick?
Regards, Muhannad