I think the syntax check for emails was added in 6.1.
Here's the check in 6.1b3:
code:// Check the email format if (!eregi( "^[0-9a-z]([-_.+]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\.[a-wyz][a-z](g|l|m|pa|t|u|v|z|fo)?$", $Email)) { $html -> not_right($ubbt_lang['BAD_FORMAT'],$Cat); }
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