ispCP don't send emails (and all virtuals too)

[alpracka]

Hello everyone, thanks for reading this.

After a few days I'm out of ideas, where can be problem. So I will be happy, if someone can help me - thanks a lot!

Situation:
1) I've installed ispCP 1.0.7 RC2 on virtual machine - everything was ok.
2) I needed to change default domain name, so I did steps like in this thread - http://isp-control.net/forum/thread-10237-page-2.html . Everything was working alright, except email sending.
3) ispCP admin panel has stopped send emails and also virtuals with php mail function.
4) Interesting is, that sending emails via Webmail application is working fine.
5) No sign of errors in logs.

Steps i have done:
1) I have upgraded to ispCP 1.0.7 Stable (build: 20101124) in good faith, that it will help. Upgrade was succesful, but situation with emails is exactly the same.
2) I guess most similiar problem was resolved in this thread - http://isp-control.net/forum/thread-11785.html . But I really don't know, what to change in php.ini (fcgi/master/php5), there's nothing with hostnames :/

So I'm asking everyone for help, very thanks for reading this.


Running updated Debian Lenny 64x.
ispCP 1.0.7 Stable - build: 20101124


Edit: Could it be by settings of DNS of root domain? Eg. my FQDN is srv.domain.com, but I have set MX record of domain.com on google.. could it be? (but strange is, that virtuals cant send emails via php)