Emailing calendar event question

Is it possible to email a calendar event from my iMac to someone with an iPhone, so they can easily add the event to their calendar? If I email an event, the outgoing message says:

"To add it to your calendar, click the link below"
But when they click the iCal...ics link in the email, nothing happens. I know if I view the same email on my Mac in the Mail app and click on the link, I'm prompted to add the event to my calendar.

-Thanks