Help with groupjive joomla component! (urgent)

Hi... I´m using GroupJive 6 beta3 rev617 component in my Joomla 1.0.15 with CB 1.2 RC2 Using GroupJive on Share Siteground host: You can send invitations via email or PM to any user so they can join the groups, and the users can clic over the url activation link inside the message body from GroupJive (PM: UddeIM 1.2) and the system accept message from the GroupJive display ok...etc. Using GroupJive on VPS Siteground host: The component can´t send any invitation via email or PM.. something block this function on the server. So I need someboday can bring me the answer to solved... I asked to my host about the difference configuration between share and vps... and they told me this: I made a comaprison of both PHP configurations and this is the output of the diff command: > bz2 4d4 < cgi 8d7 < dbase 10c9 < eAccelerator ------------------------------------------------------------------- > exif 15a15 > http 19a20 > ldap 20a22 > mailparse 22a25 > memcache 25a29 > ncurses 26a31 > pcntl 29a35 > pdo_pgsql 30a37 > pgsql 31a39,40 > pspell > readline 33a43 > shmop 34a45 > soap 39a51 > wddx with "<" are marked the modules, which are present on the VPS, but not on the shared server and with ">" the ones preset on the shared server and missing in the VPS configuration. So I need somebody how knows what which will be needed, so we can add them to the VPS host and make the groupjive work like the share host... or what php extensions and libraries the groupjive needs to work ok. Its urgent for me! Thanks