Check out this FAQ entry and try to configure your install with one of the other e-mail modes. Also try changing the have_pear variable in your config.php.
Finally, do a search for isvalidinetaddress. Many people have posted about this before.
04/21/04 05:03pm
Matt
Anonymous
Thanks Turias. For some reason I searched around and couldnt find it, but I have it fixed now.
For any interested... I just had to change the have PEAR variable to false so that it would pick up the PEAR modules that ship with geeklog.