Comment notification fix requested

I’ve had problems sending e-mail from WordPress. I was able to get the e-mail working that’s sent from /wp-login.php (“Your new password”, “Password Reset”, etc.) by changing the calls to wp_mail( to instead be mail( and
adding:
ini_set(“SMTP”,”mail.mysite.com”);
ini_set(“smtp_port”,”25″);
ini_set(“sendmail_from”,”[email protected]”);

I’d like to now get the comment notification e-mails working but I’m not sure how to do this. It looks like it might be pluggable.php and/or pluggable-functions.php located in /wp-includes/.

Could anyone offer some help, please?

FWIW, I don’t have any problems using the wp_mail function on WordPress installs I have on Apache servers. It’s only on an IIS6 server that wp_mail fails but mail works in conjuction with the ini_set lines added.

Thanks in advance