Ironport IP Interface question

[christina_ewing]

Hi there,

our current ironport setup is 1 IP interface and 1 listener to handle all inbound/outbound email traffic.  Is it possible to create a second IP interface with a new IP on the same subnet, that will be NAT'd to a different external IP address?

Reason for this is we want normal mail flow to go out on our existing external IP since it has built a reputation, now we would like to send email out on a different external IP for marketing purposes.

Thank you for any help in advance. 

[christina_ewing]

I've tried adding another IP interface, and a new listener associated with it.  But when I do all mail flow wants to use that new IP interface.

[Libin Varghese]

Hi Christina,

Please review the below article to understand how delivery interface is selected.

http://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118575-qa-esa-00.html

I would think based on the default gateway and lower IP on the subnet the same interface would currently keep getting selected.

Thanks!

Libin Varghese