WordPress E-mails and Google Domains

Hi,

A few months ago I switched my domain’s e-mail addresses to Google Apps. Everything went smoothly, except any e-mail that is sent from WordPress (comment notifications, e-mails from a contact form, etc.) goes to the old e-mail account on my server instead of the e-mail account on Google’s servers (they have the same e-mail address). I’m not sure if this is a problem with WordPress or my server, but it’s only evident with the e-mails coming from WordPress.

Any ideas on how to get everything going to Google’s servers?

Thanks.