Event email trouble

Hi gents,

I am facing a problem with Event Invitation Email. When I send out invitation email to delegates, I receive a message that “Sending the invite emails has failed! Please check your email settings.1”. The emails do not get send out.

The campaign and notification emails send out as expected.

Thanks in advance.

… I find that the problem is on email template. If I remove the event links, the email work correctly. Why?

So, something is wrong on default event invitate email template. Any suggestion?
Many thanks