From: Frank Cox Sent: April 9, 2008 20:01
On Wed, 09 Apr 2008 19:54:28 -0700 Hugh E Cruickshank hugh@forsoft.com wrote:
Is it possible to force sendmail to use a specified host name for outbound email to a selected domain name instead of the host name that can be found by looking up the DNS entry?
I'm not entirely sure that I understand your problem. If you have a unique domain name, and your client also has a unique domain name, and your dns records are properly configured, then sending email from domain name A to domain name B should just work, regardless of how close your actual IP addresses are.
I agree whole heartedly that it "should just work" but time and time again we have see where it does not work.
Having said that, you can put a domain name and IP address in /etc/hosts on the originating computer and that computer will henceforth use the IP address specified there.
That would work if I was looking to use a specific IP address but would like to use a specific host name. For example I would like all mail outbound to example.com to bypass the DNS/MX entry of mail.example.com and use instead backupmx.isp.com not just the IP Address of backupmx.isp.com.
Thanks muchly for your suggestion.
Regards, Hugh