PHP & Pear::Mail Memory Exhaustion

Answer 1

Without having used Pear::Mail_Mime I'd bet you run out of memory because you create a brand new Mail_Mime() object on every loop iteration, when it seems like it's the same in all of them.

Create as few as possible, taking it out of the outermost foreach.

Same for $mail. You can probably re-use the same $mail object and feed it new headers and body.

To make sure where your memory is used, surround the suspect lines with memory_get_usage() and log its output to see the increase.