I've inherited a wp site on a windows 2003 box with iis6 and php.
All of a sudden, any mail-related function throws an http 500 error and I get no output.
I've traced through the code to find the offending line: wp_mail ( );
If I comment it out, no error. (No mail, of course, but no error). Firebug gives me the http 500 error and some other info but nothing points to a culprit.