I have noticed that Yahoo email delivery tends to be slower than other services such as Hotmail, Gmail, etc.. As such I have placed a note in the registration page to alert new members to consider using a non Yahoo account (so they can get their confirmation email and other site notifications faster).

Yahoo has a tendency to "delay" processing emails that they receive sometimes 30 minutes or more. It is somewhat unpredictable (some emails go through instantly). All our emails sent from the board are signed with DomainKey and SPF records (these are anti-spam signatures to prove it is a valid email). We emailed Yahoo to ask them to "white list" our site and I will see what they say. This issue is nothing new and of you look around the internet this is a well documented (but not heavily publicized) problem for Yahoo accounts.

I will keep you posted on if we can find a solution, but I thought it was fair that I recommend that people use alternate email accounts (other than Yahoo) so that their emails are delivered as quickly as possible.

Update: I just wanted to add that using Yahoo email accounts are totally ok . The issue is only that Yahoo specifically delays emails sometimes (but they will still get there).