Hi, I have a Barracuda Spam Filter which accepts our incoming smtp and passes it on to our Exchange Server.
For Outgoing emails the Exchange server sends directly out.
I have static Nats set up as follows (external IP's replaced)
static (INSIDE,OUTSIDE) 22.214.171.124 10.0.0.5 netmask 255.255.255.255
static (INSIDE,OUTSIDE) 126.96.36.199 10.0.0.6 netmask 255.255.255.255
also access-lists as follows
Exchange (https & www for Outlook Web Access)
access-list OUTSIDEIN extended permit tcp any host 188.8.131.52 eq https
access-list OUTSIDEIN extended permit tcp any host 184.108.40.206 eq www
Barracuda (incoming SMTP)
access-list OUTSIDEIN extended permit tcp any host 220.127.116.11 eq smtp
Problem is when I send emails out, it goes out as 18.104.22.168 which does not match up with the MX record that points to 22.214.171.124
Therefore we are receiving Reverse DNS failures from recipients
<exchange1.ourdomain.local #5.7.1 smtp;550 5.7.1 Client host rejected: cannot find your hostname, [126.96.36.199]>
Is it possible for our Exchange Server to send out via 188.8.131.52 ? (I cannot use the Barracuda as an outgoing relay)