Good morning

I hope I get here more competent support as on the members area

What I have:
-vbulletin 5 / itself hosted

What I've done:
-3 hours browsed all support pages and topics
- internalized mail issues page by VB.
-diagnostic mail by VB (successfull)

What is the problem:
-Welcome emails, free circuit mails etc are sent
-Password reminder via AdminCP brings me a white page, no mail will be sent
-shipped no topic overviews, bulletins etc.

What I do know:
If it would be on the server, not a mail would be out so please help