PHP/sendmail forwarding to other mail server

[agnethe]

I am trying to send mail through the PHP mail() function. I want the message to get forwarded from sendmail to our mailserver and let our mail server do the delivering. I am using webmin to the configuration. I have tried to set the &quot;Send outgoing mail via host&quot; option to 192.168.0.5 which is the address of our mailserver. However, the error message tells me that <Host unknown (Name server: 192.168.0.5: host not found)>

If anyone can tell me what I am doing wrong and let me know how to fix this I would greatlyy appreciate it.

Thanks,
Agnethe