We've tested this like crazy and it's always seemed to work for us. I tested sending myself emails from our referral page and got both emails from my 2 attempts. We give out a lot of free snipes every day so I think this is working. Every once and again something happens where maybe an email address is wrong or they used their friends normal email addy and not the one that friend uses on eBay etc or whatever and we have to manually give someone the credits, but the automatic ones normally work.