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Not much information to add.
I have the following code:

if(mail("somebody@nobody.com","subject","body","From: ...")) {
 echo ("success");
} else {
 echo ("fail");
}

This always returns fail even when the email has been send successfully.

I am running php 4.2.2 on Apache as module.
Using default mail setup etc.

I've got the same problem with apache 1.3.27 and php 4.2.3 as a module.
The mail function always return nothing, and i can't find any error message in my logs files.
I tried to build php as a binary (not an apache module), and in this form the mail function works fine.

This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.