Yeah, UCAS often gets knocked out this time of year, either by specific DDoS attacks trying to keep it down for tomorrow, or by the sheer volume of people thinking there's some possibility they'll be able to find out ahead of time. Either way, the amount of server power they've got it should be fine tomorrow - they haven't had any serious problems for years now.
Also, god knows what's up with your email but I highly doubt it's related, unless you've been panic-refreshing it in which case you may well have crashed one of their servers too.