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CSS aggregation with Zen-based theme caused one particular server to stop serving Drupal pages

Weirdest. Server. Drupal. Zen. Bug. Ever. Our client's site suddenly stopped working. With a server error.
Safari can’t open the page. Safari can’t open the page “http://www.example.com/landing” because the server unexpectedly dropped the connection. This sometimes occurs when the server is busy. Wait for a few minutes, and then try again.
Opera was just a blank white screen. But other sites on the server were still working.

Set the return path for e-mail sent by a web server

ServerAdmin webmaster@host.some_domain.com

this is set for us, but apache process (Linux user www-data) still is sending e-mail as www-data@domain.name

nada:
Won't send email
http://drupal.org/node/103092

help with drupal sending mail
http://drupal.org/node/11570

I think I've identified our problem:

php mail() set from address

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Transfer sites from old host to our new server steps.

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