Emails originating from wrong public IP
Posted on 2014-07-27
Recently my company has purchased a Zix email encryption gateway. We have added the A, MX and PTR records successfully (Verified with mxtoolbox). To switch between Exchange and Zix simply requires changing the send connector.
Before changing the send connector; Headers correctly show the origination IP - .44 (Our exchange server)
After changing the send connector; Header incorrectly show the originating IP - .2 (Our Sonicwall)
Email flows fine - But because the originating IP in the header is showing our Sonicwall (.2) and not Zix (.88) our emails bounce back from Barracuda and McAfee secured domains.
I've recently changed the send connector back to not use Zix until I can figure out how to correct the header information on emails going through the Zix gateway.
Could someone tell me - In order to change the originating IP in the email header is there a change needed to be made to Exchange or the Sonicwall - And how to do so would be very helpful.
Public IPs end in:
Firewall - .2
Exchange 2010 - .44
Zix Gateway - .88