Is it "normal" for notification emails to be delayed by 4-8 hours?

I do most of my work late at night. And, in trying to test out my form, I fill out the form in a browser and send it to one of many Email accounts I have. I have noticed that forms I send out between 3am-6am are sometimes, not received until after noon the next day. Sometimes, as long as EIGHT hours from the time it was submitted. That was a problem but I had hoped it was a rare problem. 

But, today, I spent most of the daytime hours testing out forms and still, only received about 60% of the emails that I should have received. There are a few that I know WHY they were not received (much of what I try to achieve is via trial & error). But, just as many, were NEVER received.

I made sure that my account email would not bounce when I set everything up.

I have cleared my caches.

What's the deal? 

The short answer is NO. Emails should be delivered right after the form is submitted. But I noticed that you are using an AOL email address/SMTP details for the notifiers/autoresponders and I'm sure that the issue is related to that. Please note that SMTP details for a free email address is limited to 100 outgoing emails per day. If you are using this method for your entire form, I'm sure they're limiting this feature to you to avoid some possible problems.

Now to fix this, please try using our default noreply@jotform.com. See if that works for you. But if you are using an AOL as the recipient email, I would suggest whitelisting us first and/or add our sender email to your AOL contact list.

If the default sender is not working for you, please try using our Mandrill SMTP method. In most case, Mandrill really helps:

http://www.jotform.com/help/236-How-to-use-Mandrill-to-Send-Emails-From-Your-Own-Email-Address

Thanks