BuddyPress.org

Hi, I´m new to BuddyPress (not so much to WordPress) and I´m having a bit of trouble getting it to work as expected.

Let´s go to the details…
I´ve setup two different installations of WP(Multisite) + BP in two different servers.
in both cases I get everything running with the exception of:
— @mention email notification
— friend request email notification
— reply email notification
strangely enough
— private messages
— new user regisistration
— new user activation key
get through and send the right emails

just for the record
Every user/profile used for testing purposes had a valid email address and all the notification emails checked in each profile configuration
WP(multisite) 3.0.4 with a single site for now and followed the installation guide
BP 1.2.7
No other plugin installed or runing
As I´ve said some Emails do go out (It´s not an email server problem) and just in case I´ve made some tests configuring SMTP but got just the same results.

BuddyPress is a great application and seems to work lovely with WP.
Is there a way to fix this problem and get those emails out?
That would be fantastic.

Please let me know of any possible tweak, tip, trick, hook or whatever may do the magic

Thanks in advance,

Andrés