Just installed this plugin and it’s looking good.
http://coffee2code.com/wp-plugins/configure-smtp/
This is the second time I’ve had this happen. The first was with my 2.3 installation, comment notification just stopped. I fixed it easily by deleting my email addresses and re-typing and saving. Then it happened again the other day on the same installation, this time my fix didn’t work, or any of the others mentioned in this thread. Today I upgraded to the latest version, and nothing has changed, tried all the fixes again to no avail. A great nuisance to say the least.
Good one podz, set it up this afternoon, good way to check out version 2.
Found the solution, deleted the “Auto close comments” plugin.