I am using Sendmail on a Centos server to send email for PHP scripts, but the problem is that mail is delivered to a local mailbox on the machine rather than what is specified in the MX records for the domain - which actually point to another machine I use for email.

I would like sendmail to not try and locally deliver mail for the domain the machine is setup for, is there a simple way to disable local delivery?

The domain is not in the local-host-names file.

I've already done lots of googling and I have looked at:

http://serverfault.com/questions/26934/sendmail-configuration-to-not-deliver-mail-to-local-machine

http://serverfault.com/questions/65365/disable-local-delivery-in-sendmail

But either there is no answer or it is not suitable.

I don't want to relay to another server, i just want it to send mail regardless of domain.

To provide an example:

I have two servers, one is the mail server at mail.example.com and a web server which is example.com, when I use the smtp service on the web server it currently routes mail to a local mailbox on example.com, but it should be going to mailboxes on mail.example.com

Output of sendmail -bt returns:

ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter  
> 3,0 [email protected]
canonify           input: info @ example . com
Canonify2          input: info 
Canonify2        returns: info 
canonify         returns: info 
parse              input: info 
Parse0             input: info 
Parse0           returns: info 
ParseLocal         input: info 
ParseLocal       returns: info 
Parse1             input: info 
Parse1           returns: $# local $: info
parse            returns: $# local $: info