CachePuzzles

Hi there, I'm probably missing something simple, but I'm just setting up my first site so I guess that's bound to happen. I've installed the LoginRegistration module and at first I was thinking that the confirmation emails weren't being sent. However I now see that new user confirmation emails are taking 20+ minutes to arrive. Is there a way to speed this up? Also the email is coming from processwire@mydomain - I couldn't found a place to change this. Any advice or help would be great! Brian