BuddyPress.org

One approach might be to configure php.ini to use the smpt localhost and port lines (i.e uncomment) and set an explicit sendmail_from address or simply configure sendmail,

I’ve never had an issue with sending email reg confirmations from a test environment but then I scrabbled around and worked out how to configure ‘fake sendmail’ which essentially amounted to stating a true smtp server to use e.g my main email account.

This is one of those issues that is not really application based necessarilly but more server OS oriented and finding a solution may be quicker focusing on these aspects rather than WP/BP and perhaps trying in a WAMP forum? or XAMPP? for a solution?