Exim sendmail faults

I apologize; this may be more a question for the people in php-install. But I'm having some problems with my mail stuff in PHP. I have Exim version 3.12 installed, but I'm not getting any mails sent out by PHP. I *do* get this error mail, however: This is automatically emailed back to me: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. The following address(es) failed: email@theemailaddress.com: unrouteable mail domain "theemailaddress.com" This is in the error log files: 2002-07-02 03:26:13 17PI3B-0003sM-00 <= root@theipaddress.org U=root P=local S=2 95 2002-07-02 03:26:13 17PI3B-0003sM-00 ** anotheremail@anotheremailaddress.com: unrouteable mail d omain "anotheremailaddress.com" 2002-07-02 03:26:13 17PI3B-0003sO-00 <= <> R=17PI3B-0003sM-00 U=mail P=local S=1 063 2002-07-02 03:26:13 17PI3B-0003sM-00 Error message sent to root@theipaddress.org 2002-07-02 03:26:13 17PI3B-0003sM-00 Completed 2002-07-02 03:26:13 17PI3B-0003sO-00 => root <root@theipaddress.org> D=localuser T=local_delivery 2002-07-02 03:26:13 17PI3B-0003sO-00 Completed Any thoughts? I know all these e-mail addresses and ip addresses are valid (they're either mine or of acquaintances), but the server seems to fight me on this one. __________________________________________________ Do You Yahoo!? Sign up for SBC Yahoo! Dial - First Month Free http://sbc.yahoo.com