A few weeks ago I was non-maliciously using a website with server-side calculations when curiosity got the better of me and I decided to mess with some GET request values. I expected the site to give me unrealistic math calculations, but what I didn't expect was to accidentally crash the site for a bit over an hour. At first I thought it was just coincidence, so when it was back up I did it again. This time it went down for over 2 hours.
I felt really bad since I liked the website and didn't intend to cause damage, so I emailed the email address I found from whois explaining the exploit and my non-malicious intentions. The owner, however, has not emailed me back since nor has the owner repaired the exploit. This makes me wonder if he received my email at all and if there is another way to contact him.
What should I do, should I disclose a Denial of Service bug?