Description:
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I'm working with PHP 4.3.3, but have tested this behavior in HPP 4.3.6 as well.  When using the mail function and attempting to send attachments in HTML email, the message body you send is empty looking something like the following:

mail("address@somewhere.com","Subject","",$headers);

The mail function will freeze due to the "" for the message body.  This behavior does not occur under php 4.2.3.  Past scripts I've written to post this sort of complex mail that work under this version of PHP freeze when set to run under PHP 4.3.3.

Did something change?  I didn't see anything in the documentation, but I'm sometimes blind like that.

Thank you for your help,

-Ethan Nelson,
Modulus, LLC

Reproduce code:
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$headers=<complex mail>;
mail("address@somewhere.com","Subject","",$headers);

Expected result:
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I expect the mail function to run and send the mail through our exchange server.

Actual result:
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The mail function freezes and a PHP hung process appears in the task manager on the server.