Mail() Function Not working????

I'm a designer not a sys admin nor a programmer. But I have a guy doing some work for me and he says that mail sent via his php scripts isn't getting sent. I'm running RedHat 7.3 with PHP (4.3.4) loaded dynamically under Apache 1.3.29. I took a look at php.ini. The sendmail statement looks as though its pointing to the correct location. Not that this is big news to people that know me, but, I'm stumped. Any help would be appreciated. Thanks, Bob ><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>< >< Chief Executive Dummy E : bcohen@bpecreative.com b.p.e.Creative W : www.bpecreative.com P : 508.384.0405 ------------------------------------------------------------------------ -- Fine web sites for discriminating companies(tm) ------------------------------------------------------------------------ --