Working on an installation with a non NAT ISP connection (block of 10 IP's)
xx.xxx.xxx.217 is the main IP address
xx.xxx.xxx.218 is the mail gateway
Domain xxxxxx.org.uk is hosted remotey and resolves to host IP address OK
MX record for mail.xxxxx.org.uk points to xx.xxx.xxx.218 for the incoming mail server - receives mail OK
When email is sent out however it sends through xx.xxx.xxx.217 the main IP address
If the receiving domain uses revers DNS the IP address does not resolve to the domain / mail server and fails to send
My initial thoughts are to setup two MX records - "outmail" and the other "inmail"
inmail will point to xx.xxx.xxx.218 - mail gateway
oumail will point to xx.xxx.xxx.217 - main IP address
Then change the SBS virtual server properties with FQDN and Smart Host of outmail.xxxxxx.org.uk
Would this work or is there a simpler / better way of resolving the ougoing mail and reverse DNS resolution problem ?
Thank you for reading my post and considering your reply.