Description:
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I use a MIME mail class to send HTML emails. The class prepends the headers to the body, then sends the message as follows:

$email .= "MIME-Version: 1.0\r\n";
$email .= "Content-Type: text/html;\r\n";
$email .= "Content-Transfer-Encoding: 7bit\r\n";
$email .= "\r\n";
$email .= "html message";
mail($to, $subject, "", $email);

This code worked in 4.3.2 in windows.

Since upgrading to 4.3.3, the same code causes Apache to crash.

As as workaround I changed the message parameter to a single space, and Apache does not crash anymore.
mail($to, $subject, " ", $email);

System Setup:

WinXP SP1
Apache/2.0.47 (Win32)
mod_ssl/2.0.47
OpenSSL/0.9.7b
PHP/4.3.3
MySQL/3.23.58-nt-log