First of: this is the third time I really try to get this crippled version of a MTA working. Since you don't support any other MTA & I'd like to use something that works well with the rest of webuzo - I'm stuck on this.

Second of: stop asking me for root credentials! I'm not going to let anbody I don't know, play on my server.

Despite that I'm an IT Professional and I'm capable of making things run quite well IF the stuff follows the rules -  fact is, this thing you call a MTA isn't following anything.

1) Why the hell does YOUR Squirrel Webmail not work with YOUR Dovecot?

Infact I had to reconfigure squirrel and use port 993 cause YOUR Dovecot-packet doesn't seem to fetch the "disable_plaintext_auth = no"-Option!

BTW. This isn't the first installation I had exakt that problem with - so please show some professionalism and don't try to tell me this would be a misconfigured server setup kind of problem. I use always CentOS x64 - basic server setup.

2) YOUR MTA-like Exim-Packed doesn't at all - at least in a professional environment (behind firewall, etc) - except sending mails to itself.

The bad thing about that is, that nobody is able to debug that crippled MTA by themselves, 'cause no one knows where the rest of it is gone.

I suggest you do that thing you got paid for (by buying that license)

and try to assist by making suggestions 

and/or explain where the rest of exim is.
Or you could et least for once make a clear call and tell us if an standard packet of exim would work with the webuzo gui (services f. e.)

3) A lot of threads are cut of by you like "send us a support message" or "send us your details" or something like that, instead of actually helping people to help themselves. This exactly the thing which pisses me really off.

You have made a quite well product and every product has its bugs. But there is very little support for your product on the internet - because YOU DON'T ANSWER QUESTIONS!!!