Registration Emails and Activation Emails not going :(

Hello, Im on Joomla 2.5 and my membership pro is 1.6.2

It all used to work fine before, but recently it has stopped sending activation emails to customers who subscribe.

When someone registers, he gets this email -
prntscr.com/ispv2x


How to solve this issue now ?

Ini global config , my email config is right as well - prntscr.com/ispvdn

Membership Pro config panel - prntscr.com/ispv9o

That mean that mail setting is wrong, it doesn't allow sending email from that From Email address. Looking at Global Configuration, why SMTP host is localhost, it doesn't look right to me

I guess mail settings is wrong, and the mail feature doesn't work over all your site, not just only in Membership Pro

Regards,

Tuan