Anything kwown about a google apps for domains authentication integration with xoops.
Some other CMS systems have "working" betas.

Hi,

Provisioning API does provide a way to programmatically create and
manage user accounts.

The PHP client library is available for download here:
http://code.google.com/apis/apps/libraries_and_samples.html

Also, here is a link to PHP Provisioning API v2.0 developer's guide that details the API with sample code:
http://code.google.com/apis/apps/gdata_provisioning_api_v2.0_reference_php.html

See:
http://framework.zend.com/download/gdata/
http://code.google.com/apis/apps/overview.html

Does the phpmailer 2.0 support Google Apps?