[exim] SMTP relay server configuration

Hello!

I'm googling for days now but I'm still very confused how to configure exim to fulfil my intention. I'll explain what I want to:

What I need is a very simple setup:

1. I want exim to accept local mails ONLY (so there is no need to encrypt data to the local SMTP)
2. Forward the mails to another SMTP (to my provider, which is GMX)
3. I want exim to connect to GMX over SSL
4. I need to authenticate at the GMX SMTP with username and password (no SMTP after POP3)

With my current configuration file (which is provided by Debian) I'm totally overwhelmed. It's so big with a lot of stuff I do not need. What I really want to have is a small configuration file with just the features above. Could someone please compile a configuration file or point me to a good ressource where I can find the information without reading for hours?

I often read thinks like "use /bleh/gencertificate" to gernerate a self-signed cert for the server. Is this really neccessary in order to connect to GMX? Or is this only needed if I want to connect to *my* SMTP over SSL?

Is it possible to *not* run exim as daemon to fulfil this tasks? I intuitively feel that exim can be started each time a mail is to be delivered because only local mails are accepted, is this true?

Thanks in advance,
Simon
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Simon Fuhrmann | SimonFuhrmann at gmx.de