IMail not receiving messages from sendmail()

IMail not receiving messages from unix sendmail command via PHP

[mikewOZ]

Has anyone ever experienced a problem with IMail accounts where every mail account on a domain will not receive messages that have been generated using the unix sendmail() command? Well, actually I am using the PHP mail() function, but that uses sendmail() right?

[BjarneDM]

I'm expriencing the same problem.
the problem seem to be related to the setup of sendmail.
at present, when using the mail function in php, every email is sent from the www account with the domain being what sendmail has been set to.
now, some smtp servers do a reverse dns on the sending domain and simply rejects these if it's not valid. and that's my problem at present.
I'm looking into using the PEAR extension to php as a possible solution and using the smtp-server my ISP provides as a solution.