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This one gets mentioned often. Sometimes it's just a matter of checking junk mailbox and filters and setting to make sure you can receive it or if happened to land in a junk mailbox.

Check the /inc/header.inc.php file for email addresses and verify that you entered your address correctly.

If all is well with that, then it gets a little more time consuming to track down. Sometimes it happens to be the way your host is setup or configured.

All the hosts I have ever used dolphin on work with a default install. I know people have issues and ask about this on occasion. I think some get it figured out and never post their solution that could help others. I've followed a few of these topics before, but haven't seen a well written or followed up on solution. The info out there related to this is very sparse.

Check the first two suggestions first as they are quick and simple.