After the installation of CMS Workflow, the "Save and Publish" button is no longer working properly.

First, here is the code that I added to the \mysite\_config.php file for a two-step workflow:

// CMSWorkflow
Object::add_extension('WorkflowRequest', 'WorkflowTwoStepRequest');
Object::add_extension('SiteTree', 'SiteTreeCMSTwoStepWorkflow');
Object::add_extension('LeftAndMain', 'LeftAndMainCMSWorkflow');
Object::add_extension('SiteConfig', 'SiteConfigTwoStepWorkflow');
LeftAndMainCMSWorkflow::set_prompt_admin_for_comments(false);

Too much? Too little? Something I missed?

So...after an edit is made to a page and I select "Save and Publish," I received an error that says "Error saving content" and the "Publishing..." button just keeps spinning. However, if I refresh the page, the change has actually been saved.

In my SilverStripe error log, I get the following error:
Warning at \sapphire\email\Mailer.php line 163: mail() [<a href='function.mail'>function.mail</a>]: Failed to connect to mailserver at &quot;localhost&quot; port 25, verify your &quot;SMTP&quot; and &quot;smtp_port&quot; setting in php.ini or use ini_set()

I'm guessing that the error is related to the fact that it wants to email something but can't...I don't need anything e-mailed, so how do I just turn that option off?

Thanks.

Thanks, Luke...your code worked perfectly!

Cheers,
Laurie