Publisher review:It also works fine on WordPress MU as well.
The logged messages are not stored in the same database as the WP core, but in a separate table.
They can also be viewed from the admin interface.
Sorting and filtering is added to the interface, in case the number of messages is too big to find data in time.
Installation:
Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
Email Log 1.7.3 is a script for Modules scripts design by Sudar Muthu.
It runs on following operating system: Windows / Linux / Mac OS / BSD / Solaris and has as system requierments: WordPress 2.8 or higher
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Requirements: WordPress 2.8 or higher
Operating system:Windows / Linux / Mac OS / BSD / Solaris
Email Log 1.7.3 script details 
